@stephan not sure I grok what you are saying. run0 can invoke a shell as root for you, but can also invoke any other command you like as root. The shell is after all just a program too. A program that is typically used to invoke further programs, but still just a program.

Regardless what you precisely invoke: run0 will tint the bg of its output (and your input) in a reddish tone. Once the program terminates this tinting ends, and you get your usual black (or white or whatever) background back.