this wouldn't help at all, July 21 -23 have most number of pre-orders, thats why its taking most time, acording to twitter itshould take longer period range soon, so even a whole week of preorders willbe possible in single wave.
They can't just say "today we will invite everybody who pre-ordered in july"
You should see this from other point as well, of course there are people who will get acces faster, but imagine what would happen if everyone would be able to log in at same time. 500-2000 Sith warriors/jedi knight/whatever hunting to get 1 quest item wchich spawn aproximelly 10s each. you would be loged in but unable to do anything anyway. And thats not all, there are queues to log in, server limits of players online, server stability. And imagine what would happen with your PC if 2000 player pop up on screen at same time....