One possibility that occurs to me is using Action Points to power stunts. The player describes the action he wants to take, and if the DM considers it reasonable, he assigns the player an appropriate check or attack to make, and chooses an appropriate defense for him to make it against. To activate the stunt, the player spends an Action Point without gaining an extra action, then makes the check or attack as a standard action.
I really like this idea.
Sometimes an idea is appropriate to the narrative drama, but would become a royal pain if it were spammed all over an encounter (like Disarm / Sunder). The cost of using an Action Point puts a hard limit on these sorts of tricks. It also helps balance the one-sided nature of these kind of techniques and reserves them for the Heroes and maybe the Elite Villains.
Aside from the nature of the results, the normal rules for spending Action Points apply.
That sounds really solid.
I still think that for this particular DM's encounter, though, he should just use a monster template that can inflict Magical Darkness / Concealment on the area. It is a lot less messy that snatching items out of the PCs' hands.
- Marty Lund