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I just did a head-count on the number of robots in each rumble (of only that weight class).
Which comes to this: 458 megabots 132 minibots 170 microbots 229 nanobots
I found that interesting, that there we're fewer mini and microbots then nanobots. Maybe a microbot (>250 + <750) only or minibot only (>750 + <1500) rumble would make those robots more interesting to develop.
Thats interesting indeed, the 'Do the best you can with the least possible code' paradigm is challenging to a lot of people. My vote for an extra rumble would go to 'ExtendsRobot', although I know the winner will be kawigi.robot.Girl. I am not sure if such a rumble is possible, because I don't know if it can be (automatically) detected which base class is used.