Change:
Code:
  if ($ctrlenter) || ($left($1,1) === $readini(mirc.ini,text,commandchar)) { return }


To:
Code:
if ($ctrlenter) || ($left($1,1) === $readini(mirc.ini,text,commandchar) || ($1 == :)) { return }


Of course, if you want to send something like :test and don't want this to work then, either, you could use this instead:

Code:
if ($ctrlenter) || ($left($1,1) === $readini(mirc.ini,text,commandchar) || ($left($1,1) == :)) { return }

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