I would love to be able to put two wands of the same type into a stone of change and receive one wand back with charges on it equal to either the total of the two wands put in or 50 whichever is less.
Heck maybe even have it be 5 charges less than the total of the two put in or 50 whichever is less. I'm just tired of carrying around 5-10 wands of cure with 10-15 charges on them from turn ins
To get crazy, I'd say you could use a scroll of the same type to put one extra charge on the wand. And to get really crazy, take the collectors item "glass vial" and a scroll and get a potion.
Just something I'd personally love to see in-game.