Suppression = Fumbling (slower) reload
Not sure if it would even be possible to code this into the game at this point, but I was thinking the other night how cool it would be if the suppression effect actually modified reload times.
The mechanics of such a system don't have to be all that complicated; the heavier the incoming fire i.e. your level of suppression, the greater the amount of time it takes to reload your weapon. Considering many soldiers in WWII (and any war, for that matter) likely found themselves shaking when under heavy fire, I think a fumbling reload mechanic - complete with animations for shaky hands, of course - based on suppression would be a wonderful addition to a game as realistic as RO2/RS.