Does (or will) PullSDTS open .zip, .z, or non-TAR .gz files?
No, except that it does inspect and report on TIFFs in .tif.gz files, and both opens and stores .tif.gz. Anyone able to write Python scripts, and who wants to work with other types of special gzip files (perhaps .bmp.gz for example), could readily adapt to their own needs the gzOpen function and gzClass in the DEMpy gztar.py module here.