msg $active 9 $+ $1- maybe its would be easy if you change colour in mirc itself \"OWN TEXT\" section to green light colour. Or else some suggestion that maybe you can put in your input remote like:-

on :input::{
var %asc =  $+ $rand(3,15) $rand(,) $+ 
if ($left($1,1) == /) || ($left($1,1) == !) { goto last }
msg $active %asc  $+ $rand(3,15) $1- %asc
halt
:last
}

make sure the remote you do is not a 2nd option for user to choose and its must be no option and the only option is the remote you do.