Nope, you just get listed or you don't.
And in my experience they are extremely strict (to the point of bing anal) so if your site isn't perfect when it gets reviewed then it will be another 6 months before it will be reconsidered.
I'm not a fan of DMOZ myself. I personally believe they are a bunch of elitist losers who have way more power over the net than they deserve. But meh... As website creators we are their bitches.