Persistent, configurable blood stains are an option.
Bandages can simply be added with PAC, it doesn't take long so I don't think I'm going to code this. In addition, spawning those automatically would only cause problems as every model is a bit different and the props would end up displaced most of the time.
As per limping, it's not easy to fiddle with Source model animations. I'll see if it's possible with the Lua animation API I wanted to add, but it'll have to wait a bit.