For one, the only hud message I know of in Super off the top of my head is the spawn protection, which a cvar located in the amx_super.cfg with the description of it.
I was reffering to all huds in your server, impossible, unless you take out some plugins. Disable all stats and turn off extra plugins if you have them would disable em all. But if you just Super and stock plugins, disable all thru the statsmenu and disable the 1 in super and their yea go, kinda like what i was saying above. (have to test and do things yourself to find out alos)
admin listen = admins can reall all Except psay -That would kinda be retarded if they could.
Read the FAQ for all the admin flags what commands they are associated with. As in what flags do u need for admin listen, and all other commands