You won't see a difference with an acetal bolt. If anything, greasing it will make it wear more.Pluss the oil should help keep the bolt off the boddy ever so slightly i would of thought, im not sure but if im wrong tell me,could you use some eclipse greas or is it just a wast of time , i only just thought about it i have not tried it .
To the OP, you can always mill yourself a new acetal bolt, it's hardly as if it's hard to machine.