And life gets even more interesting on a Bell with a "sync elevator". (47, 204/205, 212 etc)
Hence the placard "Protracted rearward flight prohibited".
It works against you when flying backwards like a canard in reverse.
Then again on a Bell Medium translating rearwards can be beneficial.
Forwards, backwards, sideways is of no consequence to the main rotor, its more about the pieces hanging below it that becomes a "piloting" issue.