I'll keep it in mind, but it will also depend on what people are doing with BerryBots. I'd rather let things happen organically with people writing bots however they like before trying to force categories on them. Though some structure might encourage competition, and in turn, bot authoring. I certainly would love to have a BerryRumble and have plans for a battle runner API to support those type of use cases.
It's kind of funny how official the 250/750/1500 thresholds became. They started as the rules for some weekly tournaments (MiniBot Challenge and Robocode Little League). I wonder if those guys ever thought the divisions would remain unchanged for 9+ years. =)
If you have interest in 500 or 1000 code size classes, I say you just start making bots and go from there. I'm not sure what RoboRumble client modifications would be necessary, but they shouldn't be too hard. If the classes are interesting, other folks might follow suit. And until then, it would be kinda cool to crush MicroBots with your, uh, MicnoBots (?).
Mini isn't a metric prefix. So we can use anything before mega, but after micro for a 500 byte rumble.
KiloRumble HectoRumble DekaRumble CentiRumble DeciRumble MilliRumble
Or we can make one up
Rumblette NeoRumble TinyRumble PetiteRumble ParvoRumble GrafitRumble