(note: I'm not on staff.. so I know as much about the rules as all the other teams..
but I can ask direct sources
)
Tom--
From the rules, there is nothing against goals being toppled, turned over, or placed on their sides.
Understand, that this could likely only be done when it's not in the possesion of another team, they are going to balance, or have balanced.
Otherwise-- the FIRST rule stands, and goals may become un-upright. It was legal in FIRST competition, and there has been no rule change regarding, so it stands.
colleen