Mana drain swords do a little mana recharge. But that's only for monsters that have mana.
More customization would be awesome. New and old voices, portraits, races, characteristics, etc. = The Goodness. I'd also like to see the main player character not look so tiny and lame compared to the NPCs. Knights and Death Knights anyone? I always feel this huge urge to kill them whenever I see nicer-dressed NPCs... was that intentional by Larian?
Two words: Glowing Swords.
Yes, please keep it single-player. Maybe some multiplayer over LAN function would be nice, but I love the single-player focus because... hmm maybe because I'm narcissistic. <img src="/ubbthreads/images/graemlins/ohh.gif" alt="" />