Hi Luciferr,
Gallerysubmitter.com doesn't have anything to do with GASS
GASS is a manual tool, where AutoGallerySubmitter does the exact same thing, only automatically. GASS is perfect for assisted hand submissions - but we prefer to do it automatically without having to fill in anything apart from a few details.
You don't have to worry about how to fill in forms or worry about rules or form changes. All that's taken care of automatically
You should try it!