Any need for HP / RC / Mana monitoring in order to ensure the account in question has enough resources to perform the actions needed?

2 accounts per an instance is arbitrary? It's honestly easier to design the thing to handle the total amount of accounts needed now and possibly in the future then break it up into a bunch of apps clustered running different accounts.. It's a file access / data integrity nightmare to have identical scripts running unless it's been specifically designed to play nice while running clustered.

Any need for logging / history / etc etc? Or do you prefer an app with only the output required to view it's operating as intended?

Just about got this nailed down I think.. Will probably take a few hours to get the thing running properly (bouncing between tasks today, busy monday) but I'm willing to take a crack at this.