AS Al says above, dont limit the track, ideally you need to be looking at about 14db or there abouts of dynamic range before the piece goes to the mastering house.

Al makes another good point which is that the compression will be as transparent as possible, they are masters not makers.

Most of the things you describe are to do with the mixdown stage of the production not mastering, so go ahead, knock yourself out with comrpessors on every channel if you so desire.