There's a better choir program from EastWest called 'Symphonic Choirs' and you can make it say english words, latin words, phonetics, or just plain 'ahhs' and 'oohs'. Overall the production quality was amazing, who says FL Studio isn't as good as others?
As far as a collaboration goes, that only works online if each person does their own song from a soundtrack (ocremix has a pretty good remix of RD soundtrack where one person a piece worked on a song). In order to have a successful collaboration on one song you really need face to face contact. I've tried many times over the internet, the 'magic' just isn't there unless each person has their own workspace, their own song. Other than that it's just a matter of setting a clear artistic palette so all the remixes sound aesthetically fitting with each other rather than just a bunch of random ones mixed together.