You most certainly can play mods on the Mac (I have the MBPwR as well), though this may become a problem when Mods start taking advantage of the DLL. It takes a little effort. I had an applescript for a while that copied the files that download from the workshop and unzipped, but it stopped working and I have not had time to figure out why. Still only takes a few minutes to copy over the latest updates/downloads - I usually do it after each finished game - and have yet to have any problems other than mod conflict issues. That said, I have also played in BootCamp (Win7) and found the graphics difference to be slightly better, but have only used it when there has been a lag between versions (DLC impatience or MP compatibility). Even played it in Parallels, but have to go pretty low on the settings to work well -- and usually just revert to strategic view.