use this Flowlab Game Creator - Typewriter
and modify it to fit in the lower-left corner (I’m assuming you want it there)
then use the text compare one input being the type and another being a text box with /killallplayers
then to check if you have perms use a switch with a text compare turning it on or off
the text compare would compare an admins name and with a user info block
also for character limits just use that example into a text count filter and if its too much input that to the delete
I was basically just going to send this, it’s not hard to type, just use the Keyboard and set it to Activate On Any Key. boom, typing done (needs a few more small things, but the main part done). Then just use text compare, and put the text into the corner of the screen (or wherever you want it). It would need to be a little different of course because you would want the text to be sent through when you click Enter.