Mmm...I don't really know. I suppose so. The gaited breeds have a typical conformation that really allows and encourages a higher step. If you are talking quarter horses, you might get a similar effect from weights, but its not going to be as pronounced, because they just aren't usually built to travel like that.
Lord knows, I'm no saddleseat expert: you just learn some of it by default if you grow up with horses in the south:P I know there are a few saddleseat riders on the forum who would know better than I.
In the Friesian breed, they sometimes train with lead-filled ankle boots to get more height. They also use a device similar to the ankle chains seen with saddleseat horses; they are made of leather with rings on them. But these are never used in shows: they are training devices only.