I think this is managed in your post-processor(s). The setting to look for and change will be for "Trailing Zeros". This will change Z1.000 to Z1. or X4.500 to X4.5 .
Oh, and to force resolution, X.XX instead of X.XXXX you probably will have to make one Machine Group for roughing and one Machine Group for finishing. Edit the Machine Control for each to the resolution you desire. The problem with this is you will run into circumstances where the round off on the roughing will not leave material for finish. So, then you will be forced to adjust your XY and Z Stock to leave to compensate.