To answer your question: no twist grip on the S-70s. The engine control quadrant is a separate assembly in the cockpit, situated above and slightly forward of the center console, just higher than the pilots' heads. Its features include Power Control Levers (PCL's), emergency shutoff T-handles, fuel selectors (direct, crossfeed, off) starter buttons, etc.
Think of it like two engine throttles between two pilots, like in a lot of multi-engine aircraft, but located on the overhead panel.
OK, that makes sense. Thanks for the feedback. But from what I'm gathering from your description it sounds like they are indeed like the power levers on a multi-engine fixed wing aircraft. So the pilot is not really controlling fuel flow, he is controlling engine RPM which in turn controls rotor RPM. In the jet (and multi-spool turbo prop aircraft) controlling RPM controls thrust. Fuel flow remains under the control of the ECU/FADEC.