I'm not even sure if it's something that would be viable/possible/acceptable but- I think it'd be really cool if quarterstaff could be weapon finessed.
The feat itself applies to a wide variety of one handed weapons but since Quarterstaff has been changed to Dual-Wield this would make it a sizable difference over the other two bladed weapons which seem to be more often utilized.
It would add some dynamics to the use of Quarterstaffs by the likes of Rogues, Rangers, Monks and less martial fighters while still allowing a unique take. Individuals focusing on the rapid, spinning, quick nature of the weapon over the blunt force of say a Dire Mace.
Not even sure if it's possible but thought it'd warrant a suggestion after some IRC discussion.