I couldn't find the MandrakeMOve support list either... bummer...
From what I have learned, not all brands of USB flash drive/Keys will work with Move... on the Mkcdlive list there have been lots of reports on this. Apparently the problem is no real standard exists so some drives seem to work well and others don't get initialized by harddrake. Apacer seems to work though one report it did not... kind of messy. Same thing so far in beta tests with PCLinuxOS.
My Nexus drive doesn't work. I bought an Apacer and it worked for about 3 min before it had a hardware failure and died. The shop did not have a replacement so I traded and got the Nexus instead and it won't work.
But, if you buy the Mandrake version you get a 512MB key that works. So that may be the way to go to avoid hassles.