Personally, I think Rob Schwalb's idea is brilliant.
What do you guys think?
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I voted "have to see it in play." But honestly, I'm not really clear on what the problem is that this proposal fixes. "Non-rogues don't get sneak attack" has never struck me as a big issue in D&D. You have a bonus to hit unaware enemies, which seems fine to me.
What I would like is a move away from the Flanking Rogue. In 3E and 4E, rogues follow one simple dictum: Thou Shalt Flank With The Fighter. You stick close to the fighter, flank the enemy, and sneak attack every round. You
can sneak attack by, y'know,
sneaking, but nobody does that. Maybe you do a little out-of-combat sneaking to set yourself up for the first round, but once the fight begins, stealth goes out the window.
I would very much prefer to see the rogue follow a different paradigm, more like the AD&D backstab, where you actually sneak up on the enemy. My ideal rogue combat model would be to spend a couple of rounds maneuvering to get into position, then deliver a devastating attack on a key target--a spellcaster, a leader, whatever--quite possibly a one-shot kill. After that, you dance around the edges of the fight striking where you can.