I think you should give donators something but not too OP, because if donators get nothing they are unlikely to donate. Definitely not like a pirates server I used to play on where my friend donated £5 and got the ability to fly.
Yeah working on it now it will have to be a private pack, meaning only those who have the link to put in the launcher can use it, I'll PM you it when I'm done. EDIT: Also why TMI, that's only for spawning items in NEI does the exact same, but shows recipes and other stuff.