Healer Aug and Pac builds

44 pac 31 mend - is the full pac build. Red aoe mezz and instant aoe stun for an additional cooldown. the instant aoe stun is quite tricky to use, but it has a very small radius so with a bit of luck you can isolate a bard with it anyway. has the cheapest spread heal, which is nice.
36 pac 40 mend - goes pac just high enough to get instant aoe mezz to increase healing output (and manacost, especially on spread, which makes it a double edged sword) and adds faster cure NS utility.
34 pac 41 mend - if you're the best pac and can reliably fish out bards, minstrels and sorcs with just your single target instants. the only benefit of this is the 41 spec heal which is so strong it's basically just an overkill at that point. would not recommend.

aug follows a similar scheme.
40 aug 35 mend - gotta go fast. downgrades your heals in favor of yellow resists and 2% stronger haste. the main benefit of this is to keep your heal manacosts lower. you can get mend to 36 for a bigger group heal or put the points into pac to get an aoe interrupt with your grey aoe mezz, which is situationally useful when you know a bunch of casters already have mezz timers.
36 aug 40 mend - yellow cele and spirit resist. this ups your manacosts, but gives you the faster cure NS.
33 aug 42 mend - just enough for yellow body resist, gives you that 42 spec heal which is extremely mana efficient for massive heal output.

as for keybinds, really just gotta find out what's comfortable for you and utilize all the alt/ctrl modifiers and use /qbind macros to bind abilities to extra keys.