Does it make sense to install 2.1 an attach it to the same database as the production version of 2.0.x, or is that asking for trouble? (I think I know the answer but, it doesn't hurt to ask.)
Asking for trouble.
there are database changes in SMF 2.1, an SMF 2.0 database will not work with SMF 2.1 files.
Thanks, Illori and vbgamer45.