I'm bringing this up for discussion, mainly, so any imbalances this would cause are welcome additions to the thread.
The SM's PBAoE mez and life transfer are both oddly placed in terms of which spells lines they're in. The PBAoE mez is redundant in the dark line because there's already an AoE mez there. The only advantage to the PBAoE one is that it's a faster cast, which helps when you don't have a QC available and someone is hitting you as you can sometimes still mez if your pet intercepts more easily than you would with the longer cast time AoE mez. This is a pretty minor advantage, though. Likewise, the life transfer spells make little sense in the supp line since they cost you some health. There is no one to replenish this health on your own from the spells in the supp line, and if you have a healer/shaman replenishing whatever health you've lost, then you probably didn't need to use life transfer anyway.
These two spells would fit better practically and thematically in the opposite lines, so that the PBAoE mez is in the supp line and the life transfer is in the dark line. The supp line already has a very nice mez, but it's single target, so there would still be a number of situations where the PBAoE mez would be good to have for supp SMs. Supp is also the line people think of for PBAoE spells in general, so having the PBAoE mez there just fits. The dark line has the lifetap spells, which give the SM a way to replenish health if they're healing people with life transfer. This would be a lot like the necro's power battery role only for health. This whole transferring around health just works thematically, as well.
Currently, it might be argued that you can subspec to still have what I just described to some degree. This is true, but the reality is that the lower level versions of these spells would be all you'd get from any reasonable subspecs, and then they're just too weak to be useful. If you spec dark, you're probably going 47 dark, which means you can max out at 26 supp, giving you the green life transfer. This is alright but only in very niche situations, and because it's a lower level spell, (correct me if I'm wrong but) the cost to your health is also very low, meaning you don't really have to replenish your health if you're using the green life transfer anyway, so the synergy is unnecessary. On the other hand, if you spec supp, you're probably going no lower than 49, which leaves you with the level 18 PBAoE mez, max. This mez lasts 17s and will always be reduced by spell falloff unless an enemy is literally right on top of you. The results is a very, very, very short duration mez, that is highly likely to be resisted anyway. It's not actually something that's useable. The situation is almost identical for the AoE mez with this spec, so you're really left with just the single target mez. So it doesn't appear that subspeccing is really a way to get these sort of synergies going.
Like I said, I'm cognizant that there may be some serious balance issues to such a change, but I think it's worth bringing up and discussing.
The SM's PBAoE mez and life transfer are both oddly placed in terms of which spells lines they're in. The PBAoE mez is redundant in the dark line because there's already an AoE mez there. The only advantage to the PBAoE one is that it's a faster cast, which helps when you don't have a QC available and someone is hitting you as you can sometimes still mez if your pet intercepts more easily than you would with the longer cast time AoE mez. This is a pretty minor advantage, though. Likewise, the life transfer spells make little sense in the supp line since they cost you some health. There is no one to replenish this health on your own from the spells in the supp line, and if you have a healer/shaman replenishing whatever health you've lost, then you probably didn't need to use life transfer anyway.
These two spells would fit better practically and thematically in the opposite lines, so that the PBAoE mez is in the supp line and the life transfer is in the dark line. The supp line already has a very nice mez, but it's single target, so there would still be a number of situations where the PBAoE mez would be good to have for supp SMs. Supp is also the line people think of for PBAoE spells in general, so having the PBAoE mez there just fits. The dark line has the lifetap spells, which give the SM a way to replenish health if they're healing people with life transfer. This would be a lot like the necro's power battery role only for health. This whole transferring around health just works thematically, as well.
Currently, it might be argued that you can subspec to still have what I just described to some degree. This is true, but the reality is that the lower level versions of these spells would be all you'd get from any reasonable subspecs, and then they're just too weak to be useful. If you spec dark, you're probably going 47 dark, which means you can max out at 26 supp, giving you the green life transfer. This is alright but only in very niche situations, and because it's a lower level spell, (correct me if I'm wrong but) the cost to your health is also very low, meaning you don't really have to replenish your health if you're using the green life transfer anyway, so the synergy is unnecessary. On the other hand, if you spec supp, you're probably going no lower than 49, which leaves you with the level 18 PBAoE mez, max. This mez lasts 17s and will always be reduced by spell falloff unless an enemy is literally right on top of you. The results is a very, very, very short duration mez, that is highly likely to be resisted anyway. It's not actually something that's useable. The situation is almost identical for the AoE mez with this spec, so you're really left with just the single target mez. So it doesn't appear that subspeccing is really a way to get these sort of synergies going.
Like I said, I'm cognizant that there may be some serious balance issues to such a change, but I think it's worth bringing up and discussing.