A) I would still use WineX for gaming
B) There is a native port of RTCW, go to www.rtcwfiles.com
and downloaded the patches. If you have RTCW GOTY Edition then you can copy the files from the CD. If you have the original, you can mount the partition its on if you have a Windows Installation, and copy the files. If you need help search for installing it on Google.com or PM me.