The past 4 years, I don't think I have seen an IP called for leaping or replanting (and there are many, many pitchers who technically could be called for it). I did hear this weekend that a 12U all-star pitcher was called 2x for an IP for striding outside the 24inch "lane". That would be the first time at this level I have seen this call. I guess umpires pick and choose what is important to them to enforce?
Two years ago, one of our pitchers got called for IP (leaping) 3 times in one game....8U Districts. That's the only time I've seen leap/crow-hop called. I have seen IP for double-tap with the hands called numerous times.