You sound intent on just complaining.
Ideas are supposed to sound ridiculous at first too, so I take that as a compliment. If you offered any actual substance in your post it would be way cooler.
Players already do wear stuff that track their running stats, passing etc no? That information has to be recorded somewhere realtime and collected for it to be used at half time review. I doubt the technology isn't there for what I'm proposing. I did say the feet should be checked for offside on account that you use your feet to run with and not with your head. Do you run past players with your head? If not then everyone can agree that gaining an advantage by trying to run in front of the last defender can be decided where you put your foot. It makes it a lot easier, which is the point.