RAT 5 I've never once had to search for the thrust reversers, they're not exactly difficult to find, as to directional control well how is that any different to directional control during a landing in the same conditions you've just described? Or are we not to allow F/O's to do anything much less steer the aircraft?
I agree I don't think it's ideal splitting the control of thrust levers and reversers, for one it adds in additional reactional delay, but let's not overstate the issue here.
If a skipper deems it necessary and it's appropriate conditions he can nominate himself PF for the sector. It really is as simple as that.