ROE, or ROC as it is now called can't say anything against the games works, if the game allows you to get teamwork points in the helicopters then you can do it. The only thing they can really ban for is glitching, hacking, and a couple behavioral issues.
Flag hopping cannot be against the ROE. I mean, I've drove a buggy from flag to flag hundreds of times without engaging an enemy. How can that be considered cheating? It's not, so why doing the same exact thing in a chopper any different?