I only like to have on inputs events to be disable cuz it is easier to debug a conflicting on input event.
but if you don't want an on n off:

on *:input:#:{
  if ($regex($1,/^([+-]m)$/S)) {
    if ($nick(#,$me,oh)) {
      .timermode 1 1 mode # $regml(1)
    }
    else { haltdef }
  }
}