Dumb question DL, but is a Silver goal where if one team is ahead at HT of extra time, then the game's stopped? In that case, why not play for an indefinite number of 15 minute periods until one team's ahead at the end of the period, as with most sports over here?
Silver goal is the worst choice ever, the drama of a golden goal or the chance of penalties is much more exciting. An infinite number of periods taking 1 man off at each ko is the best idea and one that wont go on too long.