There is no mention of CyanogenMod in FAQ, and there is no policy about it. There are only 231 questions related to it, most of them are about rooting and flashing. Are CyanogenMod related questions welcome to http://android.stackexchange.com?
If it's a question about installing, configuring, or otherwise using CyanogenMod, then yes, that's perfectly acceptable. CM is Android, just like any other ROM is, so end-user questions about CM are no diferent than end-user questions about other ROMs.
If you have a question about compiling (or otherwise modifying the source of) CyanogenMod then it would be out-of-scope for this site.