If you mean BtS logging system, RoM doesn't affect it at all as it's controlled in CivilizationIV.ini. RoM's BUg mod is set to log only info and debug level python and this leads roughly to 2MB python log in 50% game length if revolution components are on. If you got those huge messagelogs in BtS logs folder, disable BtS logging systems from the said ini file.It may be the amount of logging that is turned on by default.