My barn is all Walkers, and show. Most barefoot. The majority of TWH are not flashy freaks, I'm at a show barn yet none of the horses here are padded. There's actually only a small group (as compared to the normal TWH) that are padded up .
My horse has a head nod, I never trained for it. It took her some maturing to have that happen. You need a relaxed horse and work the walk , and walk your way up into a faster walk , and lengthen the stride. Some are born having more talent than others. Some need alot of practice. Mine does this willingly on her own. It's taken a few years, tho.
Those padded up stallions you see in ads for breeding-well, they are bred to be on the pacey side so the big lick is 4 beat. If they've had all that work to be a big lick horse, how do you know that the horse is truly a quality walker? You don't.
People can have alot of problems with keeping their horse from pacing. Someone told me once "if you don't want them to pace, don't let them!"