If it's not in the list, then might as well use it as an excuse to keep someone off a server. If someone has a problem with that, just tell them to get a standard renderer.
Question 2 :
http://www.unrealadmin.org/forums/showthread.php?t=9822
Quote:
Usage
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To login as a hidden administrator, enter the following command in the console:
MUTATE HA LOGIN {password}
To get a list of supported commands:
MUTATE HA HELP
Summary of the commands:
LIST = Show list of all players (id, ip, name)
SAY {message} = Say message to all players
SAYA {message} = Say message to all admins
SAYP {playerid} {message} = Say message to a player
KICK {playerid} = Kick player
BAN {playerid} = Ban player
BANCRASH {playerid} = Ban player and crash client
BANIP {ip} = Add IP to banlist
SPECTATE {playerid} = Spectate a player
SPECTATE OFF = Stop spectating
TEAMSAY ON = Start reading all teamsay messages
TEAMSAY OFF = Stop reading all teamsay messages
PAUSE ON = Pause game
PAUSE OFF = Unpause game
CHANGETEAM {playerid} = Moves player to other team
RENAME {playerid} {name} = Rename player
SHOWMENUS {playerid} = Show unknown mod menu items of player
SHOWKEYS {playerid} = Show unknown key binds of player
SHOWACTORS {playerid} = Show unknown actors of player
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(key)=MUTATE HA LOGIN {password} | sshot