Is there a standard bonus or special bonus for sneaking up on someone successfully to attack?

We generally rule that you get a free action before initiative and they cant dodge/parry, etc. There are a number of talents that benefit from acting first.

1 hour ago, TheShard said:

Is there a standard bonus or special bonus for sneaking up on someone successfully to attack?

You use a simple cool check for initiative, they might be using vigilance as opposed against your stealth. *g*

Plus there are plenty of talents with profit from acting first. So by the time the opposition can actually move, half of them might be dead already.

It's called quick strike and is available in a number of specs

We've always avoided adding too much of a mechanical bonus because we have a player with Quick Strike and we didn't want to steal his thunder (that talents sucks a big one as is). Usually what we do is just give boost dice to initiative order, or if the players were actively preparing an ambush, perhaps some aim dice.

It's a Talent called Ambush, or Deadly Accuracy, or Soft Spot, etc.