Christopher,
I sincerely apologize. Firegoose > KEGG returns only genes that are in KEGG pathways. The issue, which I didn't realize at the time, is that most of the genes I'm entering are not in KEGG pathways. I sincerely thank you for the quick reply--too many bioinformatic software packages these days aren't supported.
On a related note, have you considered Gaggle functionality for Metacyc or other pathway databases? I realize that would be a grand undertaking, but so as to make my mistaken post not not worthwhile...
Best,
Mike