Ok, so, I almost did it.
And Abdul told my I was doing it wrong, so he made a fix. I need to learn more lua.
Still, here you go! You can use my icon for the pie menu slice, but you'll have to credit me for it, since it's my best sprite.
EDIT:
Hey, now that I think, you can give it higher throwing speeds, reduce it's mass and increase the GibImpulseLimit to make a throwable MedKit. In that way you can reach the guys you need to heal faster, or just toss it around while inventing some dialogs and a backstory:
"Dimitri, are you okay? You just recieved a bullet in your head!"
"No, Dafred, I'm starting to see everything blurry... Oh, and everything is so cold!"
"Here, take this!"
(Dafred throws MedKit to Dimitri)
"What's this?"
"Quickly, open your pie menu and use the AddHealth function!"
(Dimitri does what he is said to)
"Dafred, I feel much better now!"
(Dimitri stands up with his Kar98, aims at a Coalition heavy but gets crashed with a Drop Crate)
"Oh well."