If you're using triggers, can't you use 'Arg list:: +' to glob any commands the player enters and then use the variable %cmd.mudcommand% to circumvent the action on the mob normally taken by the MUD? I'm not sure if this can be attached to a mob though.
Code:
> help mudcommand
MUDCOMMAND CMD.MUDCOMMAND %CMD.MUDCOMMAND% %MUDCOMMAND% CMD.MUDCOMMAND
Used to match text to existing commands in the MUD. This will also match
any abbreviations.
* check for command sit with arg chair. Also matching any abbreviations.
if %cmd.mudcommand% == sit && chair /= %arg% && %arg%
Examples: TSTAT 81, 52, 62
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