Awful idea. Awful rule.
This isn't some dogshark sport like rugby ffs. Sin bins are a nonsense.
If a player abuses the ref then book him. If he's stupid enough to carry on send him off, for good.
The shorter this trial is the better.
Have been told that the Football South Fed not involved in the 'sin bin' trial this season which does seem to be a little strange when sides from other Federations will be playing Football South sides this season.