Yup, no such thing as a certified "trauma" fellowship - doing SCC gets you into trauma, ACS or SICU jobs which often overlap but not always. 2nd year of a 2-year fellowship can be any number of things - trauma, ACS, research, professional development, graduated attendinghood, etc. whatever the program sets up. The 1st year is all you need to be certified so whether or not the second year is worth it depends on your career goals.
My group does elective GS along with all three of the above (academics), and I know of a private group in Colorado that does as well. If you wanted to do just SICU and elective GS (+/- ACS) in a non-academic setting then my guess is that your best bet would be to sign on with a critical care group somewhere (either one that is SCC and does ACS but not trauma, or joining a ACCM group) then use your non-service weeks to do clinic and schedule your elective GS cases. Hard to say on typical day to day for GS+SICU alone since it isn't as common, that will also make job market harder since you need to be creative. Trauma\CC\ACS job market is good, while lifestyle totally varies depending upon the place; it is what you make it.