Thanks for everyone's replies. Great posts. Basically, my idea is based around keeping the time between deliveries to no more than 45 seconds (to be timed by 3rd umpire and sponsored clocks at both ends of ground). If a bowler transgresses then the next ball is a no-ball and so a free hit. I've spent a sad amount of time on this, but actually I think it matters. I've written up my plans in a document. But first I'd appreciate it if people could find some holes in the basic premise. Then I can hopefully fill those holes and if not then it's better I'm not pushing forward a plan with serious flaws. Thanks