Question about clock management

[jsmvol]

This applies to college football:

I noticed this in an early game last year, and I've wondered why no team takes advantage of it.

Here IT is:
After a running play that has been stopped in bounds, the clock keeps running, right? Well, if the offensive team comits a false start, they are penalized 5 yds, the 25 sec clock is restarted, and the game clock is restarted. So, you can run at least 49 secs off of the clock without snapping the ball. I dont' know if you could do this infinitely. If you can, then theoretically, you could end the game at a 0-0 tie without ever giving the ball to the opposing teams offense. I know that would never happen, but at the end of a game when you are winning, why not run out the clock by jumping off-sides when there is 1-2 secs left on the play clock.

Do you follow me?? Is there a rule about this??