Something that has no effect on game balance and that everyone would buy: sell favored soul/electric savant style wings that recharge every 15 seconds in public areas and let characters do their maintenance faster.
Perhaps a store item like boots of propulsion that recharges every 15 seconds but works only in public areas?
These wouldn't work at all in quests, so fvs/air savant/monks still have their special advantage where it actually counts.