It would be cool but I think some of that stuff wouldn't work too well on its own (Feel This Bass?). I do think that some of this stuff should make its way to future Riverruns, don't you? I mean Underworld have got enough unreleased material for at least two more full lengths, and many of the tracks that have been released lately (Croc, Burnout, JAL, Holding the Moth) were around in some form or another before, so I think there's a good chance...
I just want a studio version of "You Do Scribble"...although the boot is of pretty low quality, there's one recording out there where Karl's voice just booms out the speakers, whereas in the other ones he sounds kind of like he's in the background - I think a studio version could bring his voice back to the front and be really powerful