They will only accept extra drives if you're running a machine with more than 1mb of ram. I agree though, the drive swapping is a pain if you're on a basic machine and I'll try to make it better in a later release.
Ah. That explains it. Personally the fix would be great but I've also got the option of running it on the hdds on my a600 and a1200s. I just like going the full retro experience and using real floppies when I can :) cheers for the reply.