With Gamesparks been acquired by Amazon I would hope this feature request would be more viable now.
Allowing custom authoritative exe uploads to run on scalable servers would be a great addition. Playfab has this feature and I would like to see GameSparks implement something similar.
It would really help with realtime multiplayer games like First Person Shooters, Third Person Action, even MMO like games.
This would not be a replacement for cloudcode of course but addition. It would allow realtime server side authoritative collision detection and navmesh agent calculations, etc.
I ask cause I don't want to deal with the hassle of AWS backend. I just want to make games and spin up servers using my exe with a click of a button.