Some places have used radio frequency controllers - it depends on what you are trying to control.
Most boosters are either ON or OFF unless you're installing VFD's to adjust speed. The problem with variable speed is the time lag due to line length - this is typically adjusted based on testing - or instrumented and handled back at the control room via hard wire or radio control.
"If A equals success, then the formula is: A = X + Y + Z, X is work. Y is play. Z is keep your mouth shut."
-- by Albert Einstein
