I don't really have a good answer for you, but I just wanted to post to you before Solaris and ruin her record....!
Actually, I think a regular flap is just fine for most levels of jumping. Since you're 5'5" (ish), you probably won't need the extra "forward" of the forward flap. If you have an extra long uppper thigh and/or feel the need for a short stirrups length, then you might. I've ridden in a saddle with a foward flap and found it very uncomfortable. I'm also 5'5", but have short legs, so the flap did not fit my leg at all. As a matter of fact, my saddles have extra long stirrup bars, so the leathers hang in the right spot for my leg!