Hello
After asking around I learned that on the PC version mouse 4 and mouse 5 (forward and back buttons by default) are able to be used as a keybind. On PS4 however, I'm only able to keybind mouse 3 (scroll wheel click). After thinking it was a PS4 limitation I tried other keyboard and mouse games on PS4 and they were able to register mouse 4 and 5. Can mouse 4 and 5 be supported in the future?