The ATR72 has a sort of CWS mode as I seem to remember. I think the term was 'basic mode' when it was used. In an a/p climb, a second push on the IAS button, and it disconnects your pitch mode (and the pitch F/D bar disappears), leaving pitch controlled by the 'pitch trim wheel' (same as the v/s wheel in Boeings). Pitch can now be controlled by moving the wheel up and down. Tended to use it quite alot, as during the climb the a/p was not very good at holding the selected IAS, and tended to keep pitching up and down to catch it. Use basic mode to hold an attitude and let the speed settle down to roughly what it should be. Gives a smother ride for the pax