I'd be surprised if this hasn't been done, but I had an idea and will do it soon. You know how the E saddle on a Fender style bridge can move away from the A saddle while playing with your fingers? Of course you do. After the intonation is set drill a hole through the bridge plate and install a pan head screw so the head will be against the outer saddle height adjustment screw. It'll walk no more. Same thing for the G if necessary.