when you e-submit, you have to select your schools and pay your $
at that point, it takes them 4-6 weeks to turn your app around
if you wait until after your DAT to e-submit, your app is going to be really late
of course, if you e-submit now and change your mind, you're out money
there is no deferal -- you either submit it or you don't
my advice is to e-submit ASAP and study like hell
i hope this helps and best of luck to you!