As to the tracks rule, I believe I was either the first to pitch it or the first to use it - I forget which.... anyway, there were and are several reasons:

Firstly, no one uses tracks, it was a way of encouraging more.

Secondly in vapourbots, however much exposed wheels arent treated fairly, tracks have traditionally had it twice as bad through merit that they need to be pretty exposed to function, so in my view the weight is justified.

Thirdly they are heavier, and there is more to go wrong. Also, bear in mind that they do not necessarily get better traction - in a wheeled bot the traction is improved because the weight is focused into a smaller area, by increasing the area you gain increased friction but decreased force per square inch against the ground (I think anyway)

Personally I dont intend to do so myself, but I can see the merit in increasing the weight bonus from 10kg to 25kg.