I'm 100% for computer regulated time. But not stop it directly.
When a player is injured, time is stopped.
When a trow in or corner is taken, time runs another 10 seconds and is stopped untill the kick
15 seconds when talking about a free kick.
In this way, football would keep running its regular course, and wont be very far off 95 minutes (wich it always is). It increases when a team is wasting time.
White cards, resulting in temporary send offs for things like faking injuries and diving, or complaining against the referee.