You sure can, won't bother me at all.
I don't know what it would do, I've never done that. Heck you never know, it might be the next "WOW" in bbq.
I guess I wouldn't over do it, but I don't see it hurting anything. I'm assuming the skin will be on the bird? If so, I think it will just keep the skin moist and not affect the meat hardly at all.
The only thing I can think of is that it will be harder to crisp the skin. Would be better to use something to help dry it out towards the end. But I honestly have no "q-sense" to tell you what would happen.
go for it, you may be on to something.