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G.A.S.S. does no form filling. But it does let you use those things on the end of your arms... they're called hands. My hands have things at the end called fingers... I use these to fill in the forms.
Not sure what you are on about with mixing tgps and constellations... maybe too much cough syrup perhaps?
If you were able to explain that constellation thingy I would probably have an answer for you. The fom filling, alas, is something I have failed to do. I await my punishment in shame....