I see what you mean, but I don’t mean simply in response to recovering HP. I think that first aid (and all the illnesses and injuries related) could be expanded pretty broadly.
Like the tools in game it’d be interesting to see a variety of tools for treating wounds snd performing surgeries, medications to treat a range of symptoms, and illnesses that are symptomatic.
For example, it’d be cool to have the character menu show only your symptoms at lower levels, but as you get more knowledgeable you could determine whether you have the flu, strep throat, bronchitis, pneumonia, or even alien illnesses.
A broader range of treatment for infections would be interesting too.
I think the limb HP bars could be expanded upon to include specific statuses to each limb such as lacerated, stitched, sore, weak, numb, stiff. It feels really jarring to have an arm go from functioning to broken or alternatively bruised after getting tossed by a brute. Most musculoskeletal injury is pretty polar, such as bruises, scrapes, and lacerations or breaks and deformity. Making bleeding and laceration more common and the possibility for infection seems more sensible as bleeding fits nicely into the middle of the spectrum and bandages are stupid easy to come by, either made or found.