I think current starting procedure is a s good as it has been, with the 2 minute clock forcing the riders to come to order. Something that would stop gardening would be a concrete starting area, but they tried it in the 50s and got rid of it. I never saw that in operation. Perhaps someone who saw it being used might like to comment?
I am old enough to remember the days when even breaking the tapes did not bring an automatic exclusion and the starts then were awful and, I reckon, wasted more time than gardening today.