Mhm.
Replace the first part with this if you want a confirmation message each time you successfully create a command.
Code:
on $*:text:/^!commandadd !?(\S+)/iS:#:{
  if ($nick !isop #) return
  msg # Successfully created $regml(1) $+ !
  writeini commands.ini commands $regml(1) $$3-
}

You need to take some time and study and understand the scripts you're working with.

Nillens @ irc.twitch.tv
Nillen @ irc.rizon.net