Also spoke to the game developers.
They don't care if the game doesn't work with certain third party controllers as long as the original Microsoft controllers work.
In other words, thet dont know how to actually fix the code they probably wedged into their game, but wont admit their incompetence.
(You could possibly get around it by using something like joy2key and manually redirecting the controls)
Oh well, plenty of other games work great. The improved controller response is indeed very noticeable now.
(If they could fix the sleep problem and the memory managekent bluescreens then the GPD Win would be perfect to me