hm... I think /flip should stay...
But I don't have any solution for the "abusing"..
Why did we introduce /flip? Because it stopped the "annoying" people who crashed, started fight and other shit.. driving wrong direction etc.. spam..
But a solution, nah, dont have it.. Do we need a solution? Or are this just smart people... Many records have been set this way.. And especially at the long jumps it is easy to use for everyone, even a cow can type a fast /f when flying in the air that long...