As the title says. I know many of us really do not want to play with auto health regen, and want a true hardcoe rpg experience. An option would take care of everyone, and having no auto health regen on the hard difficulty would also make sense.
A bit late for such requests, as they'd have to compensate with more or cheaper means of healing.
If auto health regen is even in, I don't think it will take much effort to make a mod that disable it. (on PC at least