[myron]

Question for Dev: I have my VM database with thousands of movies and tv shows with good metadata, if I add my source to tiny, will it scrub the pre-existing data and start new or use current data?

Never tried Vi, but TMM just reads all the .nfo files and builds its own DB
Just give it a try

the one thing I miss about mc is that it gives you the option to select different artwork (both for covers/posters and fanart)

It is already possible?
On scraping you should get prompted with all found posters & fanarts?! No?
Either that, or you have the "automatically download images" checkbox activated within movie settings ^^

Would it technically be possible to get this running on a synology NAS?

Well, kinda
Dunno if already a java version is available for your Syno box, but if yes, i guess it would work.
Only in commandline, of course, so no GUI. But scraping & co is all possible on commandline, see here
(We might need to tweak the TMM updater, and the mediainfo detection, but should be all possible)