I like your idea of giving mage skellies auras and/or skills to cast, Vaud. That's a badass idea. Though I can already see Game typing "Cool idea but totally impossible or extremely complicated". Haha... well maybe it wouldn't be so bad to code.

Bow Mastery skill sounds great. We just need a solid physical bow that can actually carry a bowzon through end game content. The bow that drops from Lvl 5 Crucible doesn't seem worthy, though I haven't tried it so I don't really know.

Extra Shadow Master scrolls sound fun.

Magic Mastery in the paladin skill tree would be fucking awesome (or Magic Mastery skill added to Khalim's Hope or another new weapon designed for hammers). We need hammerdins to be viable for end game content. Problem is that it will possibly make Searing Light too OP.