Generalized File Selector version 1 is posted on Hobbes, again awaiting attention by archivist.
This version implements unzipping to temporary directory, and makes major changes to file selector key commands (hope you weren't used to them; changed because _I_ never did get used to them, so made it a little more like OS/2 file dialog at least in lowercase keys jumping to first file starting with that character).
Seems fairly robust. Might make you re-think the whole GUI notion. Improvements probably in store, adding tagging for moving files and directories, depends on what I find useful.