Sorry. No. All I meant by "motocross boot effect" was the inflexibility and lack of feel/fine control a motocross boot would leave you with. Pads/armour. FF helmets, thick cordura pants etc. have been around in DH "cycling" for almost 3 decades and nowadays are pretty sorted and fairly unrestricive.Motocross kits is what most guys that I meet on the trails are wearing.
On flat pedals?As per foot position, I use to place the ball if the foot on top of the pedal axle on uphill or slow tech where feedback from terrain is needed.
That's not really where you want your foot to be on a flat pedal at all.
We're gonna just have to agree to disagree on this one. You definitely want support but I personally can't think of anything much worse than a fully stiff sole when riding rough terrain on a flat pedal.For fast DH I put the foot more forward and centered in the pedal to spread the load of impacts and thats when a fully stiff outsole performs better.
Out of interest, How old are you? how much do/did you ride? and when did you start needing the extra protection from your contact points?