sounds redundant to me... but you never know till you try i guess. some of the uses for unionfs are "unified source tree management... merged separate software package directories, data grids, and more."(http://www.fsl.cs.sunysb.edu/project-unionfs.html) these things look somewhat specialized. I would think that if your using knoppix for these things you would be compiling your own kernel in a couple of months anyways, so why bother? Right?