I started a new thread here (http://www.enworld.org/forum/showthread.php?513971-Simultaneous-initiative&p=6984752#post6984752) which I hope answers your questions above.I get that each player is asked to declare his action. But where does the time savings come in? Do you have each player resolve his action by himself, once you've determined that there are nothing stopping that action from happening?
And do you always assume a PC acts before the goblin (or goblins) that he's attacking and attacked by?
(On second thought, perhaps it would be best if you replied in a new thread, but I leave that decision up to you)