You are assuming the control nodes run the public client. I doubt any code changes need to be made at all.
Actually, I'm assuming the trusted nodes aren't running the publicly-released source because that's what RealSolid said; if they were, then they'd be just as happy to let him convert the entire 12 million SC trustfund balances into spendable coins as any other node.
Because they already run new code with the amount restriction in it? A new version will be released, then everybody has the fix.