With the pets, if your doing "Easy Mode" content, and just want to leave pet in Sic mode...use Selene. She is great in that mode, using her buffs as they come around and healing when someone gets low.

When you get to harder stuff, I usually use Eos and I manage her heals myself. Hotkey Embrace on a mouseover/your target macro and treat it like its YOUR heal - just off the GCD. Its great when casting a heal on the tank to mouseover a DPS and top them off with it, or hit it while your shielding tank for extra healing.

Always use Whispering Dawn with rouse. They share a cooldown, and if you need the HoT better to make it heal for more, and embrace will get a boost for a bit of time too.

Energy Drain vs Lustrate is always tricky, but it boils down to how every minute of the fight goes. If your near to Aetherflow being back up (10 to 15 seconds or so), its ok to me to burn one or two charges to get some MP back if you still have 3 charges, saving one for emergency use, and burn it off on MP before recast if no one needs a big heal. Always use the charges up every minute, cause its a waste not to.

I never use a charge for MP when its got more than 40 seconds on recast unless I am empty, just cause you dont know when that Lustrate will be needed. Sacred Soil is a bit easier to plan for, since most times you know when and if you need it in each fight.

As far as Int Vs Mnd for points...if your serious about scholar in higher tier content put em in mind. If you play summoner and want to DPS in high tier content, put them in Int. I know it might not be ideal, but 30 mind lowers your heals a bit....but 30 int lowers your damage and in higher tier content when your pushing DPS that can matter more than a few points on heals. If you only DPS in "easier" content like 4 man instances I would just go with mind though, in there your not likely to notice a difference.