I just installed RockBox on my Sansa (v3.1) and this doesn't seem to have been fixed. That is, if I play a track off of the database, I can't create bookmarks. I can only do so if I play tracks off of files. This is especially problematic with podcasts, which have arcane filenames and really rely on the id3 tags to be navigable at all.
Anyone manage to work around this issue in a reasonable way, short of renaming all files heading into the Sansa?