I have written and successfully tested a server mod that blocks BuildBot from functioning correctly on your server (toggleable).
Be warned: During the time when BuildBot is loading, I expect mods like this will actually lag your server slightly more during the actual loading time (which will also be longer), but the load will fail with almost no bricks loading correctly. Most blockheads would not try to load again. However, some bricks will still be planted, and the hordes of commands can still be spammed, so this is not an alternative for administration. I would still reccommend the "ban-clear" method of dealing with abusers.
This will only be available through email request to me.
hoff121324@gmail.com
Nevermind, just grab it a few posts down
Edit:
I have also now finished the addition to buildbot which gives buildbot the option to use an alternate load method that can bypass the server sided load protection. It also sends 3 additional commands to the server for every brick loaded, which really adds up.
Do server hosts really want this?
Another Edit:
Ok, this is weird, but the alternate loading sequence actually seems to have 0 effect on server lag (regular buildbot doesn't affect server lag either, but whatever) and it seems to actually be faster and more accurate, but that makes no sense.