Falling Icicle
Adventurer
1.) Is the a place for DR/SR in the next edition of D&D?
I sincerely hope not.
2.) How should SR be handled to keep wizards from directly nuking, but still active in a fight?
Why should wizards be kept from directly nuking? That's like saying fighters should be kept from swinging their weapons.
3.) How should DR be done: all or nothing? Resist partial blows? Should it be against silver, magic, +X items, or various special materials based on monster?
There's already resistances in the game that make a creature take half damage from a particular type of attack. That's more than enough punishment for using the "wrong" type of attack against a monster.
There's better ways of representing the weaknesses of various creatures. Perhaps werewolves are vulnerable to silver weapons and can't regenerate the damage from them. Instead of making monsters all but immune to the "wrong" weapons, I'd rather make them weaker against the right kind of weapon. The carrot is more fun than the stick. Sure, you might run into the occasional monster that has alot of resistances and immunities and such, but those should be rare and terrifying creatures, the kind of menaces that are the focus of an entire story. 3.x used this mechanic far too often, IMO.