+1
This "should be" a fairly simple adjustment for WGT to add to clubs Create A Tournament page.
I see what happened in your Beth tournament. My only suggestion as things stand now is to set them up for more than one round. Make the first round 5 days, gives your true members plenty of time to join and up the ante and discourages carpetbaggers from their "take the money and run" game. I try to look at a new members recent score history as soon as I can if they are tour master or above. If I see they have been in tournaments in several different clubs over the prior few days or week then they just get the boot immediately.
Your suggested solution seems easy and adequate but don't hold your breath for WGT to act on it.
Good luck!