I couldn't find much but these links could help (Remember: could.)
https://retropie.org.uk/forum/topic/19094/ps1-medal-of-honor-underground-can-not-change-controller-config (I don't know anything about this website so I'm not sure if it's safe or not. Fair warning.)
"NintenDON'T sue me please haha"
Has anyone figured out how to get the analog sticks to function in medal of honor? I am using my ps4 controller on the playstation classic with retroarch and bleemsync. The analogs function just fine normally on main menu and in other games but when i change my controller configuration in the medal of honor game it never stays and once i start the campaign it reverts back to the original controls which are terrible!
Any help is appreciated!