Not sure if this was posted already but I was thinking this would be a nice change for Paragon:
Keep it a group spell that gives back 20% of each recipient's mana over 5 ticks and make it not mgb'able. This would obviously boost group play, but not ridiculously (as of now you can just sit for 1 minute to make back 20% mana) and would also boost raid play on longer events if raid was set up so that key classes were in a group together.
MGB paragon during a raid looks uber but actually benefits relatively few players (those that would otherwise be OOM) and frankly the 4% mana or so returned is barely noticeable by casters. Concentrating this to 20% for those key players that actually need it would provide a noticable benefit to raids and potentially every 15 minutes rather than every 70 minutes. Also could potentially speed up wipe recovery times and on those occasions when chanters/clerics die during trash clear and the entire raid needs to sit and wait for them to med up. As a % it would scale over time as well.
Overall, a boost to utility in groups and raids and not overpowering. And we would actually be wanted for something!
Would be enough of a utility on raids that more than 1 bl might be desired (imagine that!).