Centaurus and BOAC have hit the nail on the head...
If the handling pilot has the aircraft in such a condition that the split second between moving one's feet from the vicinity of, to actually acting on the pedals would mean the difference between life and death, then either:
a) The PNF should've taken over much earlier
or
b) the PF is so inept, he/she shouldn't be anywhere near the controls of a jet aircraft
Seriously... there is nothing worse than commencing a takeoff roll and for a split second thinking there could be some sort of nosewheel steering / heavy rudder issue, only to realise the clown sitting next to you is half asleep and resting his/her feet (not following) on the pedals.
or... trying to bring the aircraft to a smooth halt on stand, only to realise when you start relaxing pressure on the pedals that the other pilot unconsciously holds that pressure and you come to a premature stop
Or... even worse; the colossal muppet who takes over on landing well above taxi speed on a wet runway without announcing it and disengages the autobrake, causing all sorts of 'threat rich' confusion. Maybe if his/her feet weren't resting on the pedals, they would first announce and then take over, as per SOP, thereby mitigating any potential for high speed ambiguity in the cockpit.
Does it really matter how the PNF guards the controls? IMHO, not particularly, provided the actions taken satisfy the following tests;
1) The requirement is to GUARD (watch over/protect) the controls
2) Manipulations made by the PF should never be inhibited as part of this process
3) Only one pilot should be flying the aircraft at any point in time. If inputs are required to maintain the integrity of the operation the PNF should TAKE OVER
(obviously training and flying with very low experienced pilots is a whole different scenario, but please give an experienced and competent f/o a break!
)
Dream Land do you fly in the same tropical haven that offers "Caution headwind 7 knots...?"