figured out custom resolutions
There's a Custom Resolution settings under Parallels that must be enabled, along with telling Parallels what custom resolutions to allow. Once I did that, SNAP's gamode command worked as expected :)
Darrell Spice, Jr. Trendy yet complex\nPeople seek me out - though they're not sure why\n[link|http://spiceware.org/gallery/ArtisticOverpass|Artistic Overpass] [link|http://www.spiceware.org/|SpiceWare]