I agree it should be automatic. I think they made it a separate ability because they want to give Rogues a button to press. However, with the new weaponskills this becomes less of an issue.
For visual feedback, just make the floating damage numbers say "(Sneak Attack!)" or something. Lots of other RPGs do that.
I agree with this sentiment.
But talking about weapon skills. They too should benefit from Sneak Attack.
