Here's a place to share and discuss any custom/obscure rules with which you've come up, or found somewhere.
THE THEFT RULE
More than once, I've had Rogue-ish players express desire to sneak treasure away from the rest of the party. At first, I became frustrated because adventures tend to go better when everyone co-operates, but there shouldn't be any punishment to wanting to play a thieving sneak who's in it for him/herself, right?
Whenever the party finds a treasure, either in a stash or on a corpse, a larcenous player may elect to make a Slight of Hand roll against DC 20. On a success, they receive gold pieces equal to 5% of the treasure's value divided by the number of party members, plus another 5% for every 10 they beat the DC by. This assumes that they were able to secretly find and hide this much gold/treasure without the rest of the party noticing.
Any other party member may counter with a Spot check. If they beat the thief's check, then they catch the attempted snitch, and the extra treasure is instead divided amongst the party.
I might have to play with the treasure values a bit, or place limits on the rule's use, because things might get out of hand with one party member receiving an extra 15%+ treasure at higher levels. But it allows that player to indulge in their character's sneaky side without it being at the expense of the rest of the party. In fact, they'll prefer it, because it gives them the chance to receive extra treasure as well if the thief is caught. The thief may begrudge a party member with an especially high Spot check, but at least he's getting something extra and his high skill levels are paying off.






one thing to keep in mind though is that some players might not be able to keep in character. for example I had a rouge player using bluff and disguise to pretend to be a bard; but some of my other players who failed their sense motive rolls were still hostile to this character.