So pretty much it allows you to, lets say, create a page in a administration panel for your website, where you can run SQL and PHP commands from frontend instead of creating a new page to do it?

This seems like a good idea, my only suggestion would be to add a master password or validation tool if you use it. This can cause serious problems if the wrong person got their hands on to it.

I might use this though, so thanks again for a great post!