People complain about having to listen to everyone's footsteps, and how all that sound would be awful. Maybe you could just hear your footsteps? I don't know. There has to be some way for it to work and not be annoying.
Have it toggablable or something. When I host my stealth/horror servers that are made for one player at a time, it would be nice to be able to hear bots/enemys walking around.
Its not like the footstep sound would be loud, just barely noticeable. Its like complaining about the noises made when someone builds, just turn your volume down or something.