HID45: thats a nice modification. Made me think about doing the same. Only I do not have the 16340 cells so I want to keep it at 14500. It would be nice if the light could take AA and 14500 and has 2/3 modes low, (mid) and high. But if it only takes 14500 it's oke to.
The last driver I found goes up to 3,5A while the cree only takes till 3A so that is not an good idea.