I like my specialized installs, one for Uboats (Op Monsun exclusively) and three for fleet boats (TMO+RSRS, RFB+RSRD, and my PTC8 oriented for our pacific campaing (do visit
www.subsowepac.org )
when the surface warfare mod is out, then it`s a new one, thankfully I have an extra HD empty for it.
In my opinion its better a separate install (and copies of the activated mod list in case of screwups)
just my two centavos