To fix this, attacking or using a skill could give characters a -5 sneak penalty until the end of their turn. That would make it harder to pop in to hiding on the same turn that an attack was made.
In any case, Sneaking itself should probably cost quite a lot of AP. I realize that hinders "true Rogues" somewhat. There may need to be a Talent to counteract it, but only available at lvl 5 Scoundrel.
