Why would you not allow the F/O to have his feet resting gently on the rudder peddles during taxi?
. Nothing to do with ego as you would well know. "Riding" the controls no matter how lightly is not only unnecessary but intensely distracting for whoever is the pilot handling at the time. If the reason is a perceived flight safety precaution in case the other pilots karks without telling you first, then you would know from experience it takes less than a split second to move feet from the floor where they are near the pedals to the pedals themselves. The distraction occurs when the handling pilot from the corner of his eye sees the other bloke's knees or legs moving in unison with his own leg movements. Same with Nervous Nellies who hover with hands creeping towards the control wheel near the flare just in case you know, you fall dead at the flare.
Of course different captains will give you their personal views on such matters as will different first officers. But let's be sensible for Christ's sake and act normally with the controls as one would being a passenger in the front seat of a car. Most abhor back-seat drivers in a car and for good reason. And that is distraction when the driver is concentrating. Same principle in the aeroplane. Distraction. I have observed some pilots on take off with their hairy hands grasping the thrust levers in a claw-like fashion up to V1 with their hands poised in a grotesque shape as if afflicted with polio to demonstrate their readiness to abort at the slightest indication of a problem.
You can almost hear their exhalation of breath once V1 is called and in sheer relief they can take their claw from the thrust levers. It looks so bloody contrived. And is. Some pilots will always be a bit nervous when the other chap is handling pilot. And riding the controls is a manifestation of this. So be a good lad and keep your fingers and feet clear of the controls when the other chap is flying.
Doing so won't kill you you know and makes for harmony on the flight deck
.