A tiny change to perk leveling

I was wondering if you should not be able to get experience for a perk that you don't currently play : in KF1, whichever perk you're using, you can still up your medic perk by healing or you support skill by welding, etc etc.

Should we not be able to do that and only gain experience in the perk we're currently playing ?



Maybe it could help players focus on their basic tasks and then only on other things.