(except for the nosewheel steering on weightshift microlights!).
Actually all the flight controls on a weightshift work in the opposite sense to a conventional aeroplane, not just the nosewheel steering.
My argument about this earlier was that with everything working in the same sense, you condition to it naturally - problems may lay with opposing controls. This might be weightshift-style pedals with a conventional stick (as I mentioned with the Weedhopper), or for that matter push-left-roll-right-stick with conventional rudder pedals. Indeed, I know from experience that I can jump routinely between a conventional light aircraft and a conventional flexwing with no trouble at-all (having, I hasten to add, been properly trained and remained current in both).
I've been worked exceptionally hard by two aircraft which break those two "rules" - one was the American Weedhopper (stick and pedals in opposite directions, nosewheel), the other a French flying flea (no pedals - stick drives rudder - taildragger; so directional control in the flare is with the stick, opposing again all my conditioning about how to land a taildragger). However, both of these are types with excellent safety records (perhaps in the case of the flea I should say RECENT safety record), which suggests that neither control system is inherently bad.
So, (as I think Lomcevak is suggesting) are we all really making statements about our conditioning, and is the question really one of standardisation, or at-least any pilot being properly trained and remaining current on a particular control system combination?
But please, nobody try and put "conventional" nosewheel steering on a flexwing, that I'm really not sure that I want to try.
Incidentally I recently got the opportunity to fly the Rutan Starship 1 simulator, which I'd class as one of the most unnatural things I've ever flown. Not because of any particular characteristic, but because as you passed between modes of flight the control laws kept changing - which makes me think that perhaps the most "natural" aeroplane is the one which keeps behaving in the same way regardless of mode of flight?
G