PUBG and Rust are what I'd like to work on next considering that it sounds like they are very broken now. Does Rust support private servers now?
Siege is a little lower on the priority list because of the frequency it's mechanic changes. It sounds like there are other supported games with worse performance now as well.
Hunt Showdown isn't supported because it's look mechanic doesn't translate well to mouse movement. The previous framerate and smoothness of the game did not block support. The game can have 30 fps or 244 fps, this doesn't matter. What matters is the game's look mechanic behavior. I can revisit Hunt to see if things have improved since it was last worked on but this is lower on the priority list. There are weeks worth of support work for games in queue now that need to be retrained due to updates or games with look mechanics that allow support.
jerrylee, collection games can be a huge undertaking and resources are limited so it makes sense to support titles in high demand. If there is a high demand for this series then support is considered but at the moment there are other tasks that take priority. This isn't to say these games can't be played with your XIM, it may take some time to find an alternate config that works well with the games and then those config settings can be dialed in further for a better experience.