I was going to do this (as well as provide disposable companions that it wasn't applicable to) in the mod I'm working on, but have shelved the ideas for now--so yeah, I'd really like to see this too. Maybe even make it harder, so you have to carry them back to a doctor unless your medicine is ~50-75? You'd be able to fast travel of course, but would have to carry them out if you're in a dungeon.
Just an idea.
Oh, and in case anyone gets the idea to wait for me, don't. It's far from a certain thing, and my ideas are kind of quirky/Wild-Wasteland stuff anyway