Aye, I'm referring to demo as in 'the demo scene'.
Like you say, the Assassins collection is freeware and shareware - dunno about it being a nice menu (or music) though - functional is the word that springs into my mind. Some of the games are very good though - Megaworm, Pod and Mr & Missus are the ones that instantly come to mind. Nothing to look at but some great gameplay!
Sorry m8 - didn't get the gist of your last paragraph though! I presume you are talking about avoiding duplication of titles on the disc (but I could be wrong - I have been known to be wrong before - not often though!!!)