My thinking in regard to that is that it would be more difficult to implement at a featherweight level. Why? Well currently the main class of featherweight is already pretty busy.

I believe at RR and RL events the feathers are limited to two fights per show, and Robo Challenge events are usually going full pelt trying to get 40 feathers all whittled down and fighting. Trying to fit another featherweight class in there would be extremely difficult. I imagine it would be easier to do that with a small weight class such as kilobots as the turnaround time for fights would be much quicker.

But if you're talking about using Sportsman Class style rules for the kilobots, then in my eyes that could be a very good idea.
(EDIT: Yep I see that's what you were meaning )