Complete Scoundrel?
I hope this helps, but it does fall under your original argument of not necessarily being a viable choice for gamers:
There is something similar in the Skill Tricks section of the
Complete Scoundrel, specifically: Spot the Weak Point.
Skill Tricks are purchasable with 2 skill points as long as the PC meets the prerequisites for it. In the case of 'Spot the Weak Point' requires 12 ranks in Spot and with a spot attempt (DC=target's AC) made during combat as a standard action. If successful, your next attack is made as a touch attack.
I don't know if it is allowable, but coupled with...
'Point it Out (Spot, 8 Ranks) When you make successful spot check, you can spend an immediate action to grant a single ally a Free Spot Check (with a +2 circumstance bonus) to spot the same thing.'
...could make the weak spot transferrable to one ally for their next round. That is of course, the ally spends a standard action looking (but at +2) for the sweet spot the good rogue is shouting about.
So depending on how you interperet the rules, you can have an opponent forced to use his touch AC against 2 or more PCs.
Example: Rogue has 'Spot the Weak Point' and 'Point it Out' Skill Tricks. Ally1 through 3 are untrained in either Skill Trick, but have varying ranks in spot.
Round 1
Rogue: Spot the Weak Point vs target AC. Success. Immediate action to point it out to Ally1.
Ally1: Spot vs target AC with +2 bonus. Success.
Ally2: Attack vs Normal AC
Ally3: Attack vs Normal AC
Round 2
Rogue: Spot the Weak Point vs target AC. Success. Immediate action to point it out to Ally2
Ally1: Attack vs Touch AC
Ally2: Spot vs target AC with +2 bonus. Success.
Ally3: Attack vs Normal AC
Round 3:
Rogue: Spot the Weak Point vs target AC. Success. Immediate action to point it out to Ally3
Ally1: Attack vs Normal AC
Ally2: Attack vs Touch AC
Ally3: Spot vs target AC with +2 bonus. Success.
Round 4:
Rogue: Delays until after Ally3
Ally1: Attack vs Normal AC
Ally2: Attack vs Normal AC
Ally3: Attack vs Touch AC
Rogue: Attack vs Touch AC. Opponent Death. Yay!
The argument to my interpretation of 'Point it Out' allowing untrained Skill Trick-ers to use Spot the Weak Point is thus: If Spot the Weak Point is a requirement for all to benefit, why would a character take Point it Out at all when he could use Aid Another to assist a spot? The philosophy of Skill Tricks are that they are better than normal skills but not as good as feats. (Though I am happy to concede this if someone wants to constructively critique this.) This goes a step further as the Rogue becomes the key to taking down a hard to hit opponent even if he cannot land enough damage to do so himself. (In ugh, WoWspeak, this is a debuff

)
I love Rogues. There are just so many things you can do with them. I have never seen them as a massive damage dealers but as an opportunist who exploit any opening mercilessly. Use Device=cool. Bluff=more cool.
I love monks too, but that's another story.