On the first R44 the hobbs was working on the oil pressure as on the R22. It was later changed for the collective activated.
The FAA stated that only the flight time is the way to mesure helicopter time.
Then it is authorized by a lot of FSDO to have the R22's hobbs modified to be collective activated as on the R44. However do not expect to have the factory endorse it...
As an owner I prefer this solution as nobody needs to cheat on the cool down time
As a customer I have more for my money.
As an operator/CFI I hate it as I can charge less and log less hours...