The title is pretty self-explanatory. Nothing is more annoying than that you realize that you just ran into field of traps, but your character just keeps going forward and *puf*, you are dead. This would give the player some chance to actually survive or go through that area. If you want to keep going forward simply tap your left mouse button.
Opera, actually that's a really good idea. Some kind of "stop" hotkey would be really handy.
Or maybe this could be implemented in Light Step perk.