JC
I think you should relax about the hands and feet being on the controls - it makes the R/T easier and allows immediate takeover in the event of incapacitation. It is a requirement in some airlines that PNF (whether Capt or F/O) has a hand on the sidestick and feet (lightly) on the rudder pedals.. It is actually Airbus policy for PNF, though you won't find it in FCOM or FCTM at the moment...
Dual input is another matter entirely and you are right to raise the issue - full takeover of control is the only correct way to handle the situation.