An option to allow a switch weapon from right side to left side. It would enable more range of movement with leaning etc. Or maybe an initial profile options to choose left or right.
Difficulty maybe due to what an individual player is accustomed to or with practice could be proficient with both.
Enables full use of weapons with left and right hand control and may be a deciding factor for choice of weapons for someone choosing to play left handed Right hand dedicated weapons used on left side would have normal operation eg shells eject to the right. (Personally I shoot from the right)