[Nimmy]

about intentionally tipping over, you should note that there is no penalty in the rules against this, it isn't allowed to do it intentionally, but on the other hand, no penalties
my guess is that the rule is made so bots don't have wheels along their side, and tip over at start of match to gain a bigger bot ratio, without needing to open up with complex structures...

IMO, if a robot tips itself over just so it will be harder to move, that wouldn't be reason for DQing, I mean if you want to make your bot into a lump on the playing field, be my guest =)...
however if you do any other action OTHER then being that lump, THEN you will be DQed, since you are not allowed to perform any action whilsts in that position (even if when "tipped-over" your bot can drive around and collect balls)