I meant to reply to this topic a week a ago. The idea posted is decent, but what I originally had in mind was something simpler like the number of minutes it takes the attacking team to complete all objects (or the number of minutes in the time limit if time runs out) is the amount of points the opposite team gets for that round. Something along those lines. It's also much easier to explain in a place like the Event Description section on JDC. The idea needs work though, and I'm not satisfied with the amendments I had in mind.

Whatever method is used, there's still a possibility of problems with the time limit like if both teams take too long. And simplicity is needed, or at least wording in a more concise manner.