Ive seen and tried a script that is supposed to give a master rcon for the maps creator, is there any that does work?

The one you've seen probably work... you could even make it safer by making the script loop every 30MS so that it cannot be changed. Problem is, the host can "find" the Rcon you are auto setting and then, everyone would know that on that specific map, the rcon pass is always the same thus killing any kind of unfair advantage you might want to give yourself aswell as making the map so easily noob abused that it would lie unused forever.

Good luck, though.

you would be best to just setup some corner with a trigger volume, and if someone sits in that exact corner with a certain weapon, and turns on their flashlight, then set the rcon. Then it isn't defaultly being applied so people don't realize, and its only active when you're playing since you would know the combo... Until people rip the script and start abusing it themselves.

Well if thats possible it would take me a long time to make.

Also for the script i tried it on our server and it said the rcon though didn't work, and it gave out the rcon which i wouldn't use even if it did work.

I need to learn how to fix script errors.