I now have a workaround for the immovable condition levers.
I assigned the Slider on the X52 throttle to control the condition levers. I can now move them to their required position easily.
That said, it does not seem reasonable that the Condition levers will not respond to the mouse while everything else in the cockpit does. Throttle, Flaps, Parking Brake and numerous switches and knobs.
FYI, Manips with Hardware did the trick though. Condition levers respond to the mouse with Manips with Hardware selected in the Prefs.
@meierzwoA Logitech Throttle Quadrant is out of the question. No budget for it.
Thanks to all who chipped in with suggestions to my problem. Now all I have to do if figure out how to select NAV in the AutoPilot panel. Back to the Manual