Similar ideas like these have been suggested, due to the fact that health pickups recover health instantly.
For me, I'm against this idea. It would slow down Soldat's gameplay in a way. People will still shoot you when you try to grab the medkit in hopes of stopping you, but this is the difference:
1. Knowing that you will only regain health slowly, they won't feel so much of an urge to quickly kill you, slowing down gameplay in a way.
2. This will create strong buffs to weapons, resulting in weapon imbalances. Espeically guns like the Ruger, which is already potentially overpowered in some sense.
3. Now whenever people grab the health kits, they start running. The fight isn't gonna get intense, gameplay is going to be slowed down.
So, I'm against this idea.