No, JSWolf. W&O don't work at all in kepubs. Test it if you want.
They USUALLY work in epubs. But you can get cases when the W&O control is not behaving fine. Or at least it happened some FWs ago when I tested it. As I said I'll try to dig for my last post about it later.
EDITED
I've found the post I was mentioning.
It was in FW 3.5.0 thread.