1) I think stun recovery is covered under the setting used, see phaser setting table.
2) Dodge affects all attacks until the character has an action again. Block I don't remember My group House Ruled that your Block drops by one for every attempted attack.
3) I think that you declare your actions first, that's how you determine initiative. My group everyone declared their first action before the round along with just the number of additional actions they might attempt to take.
4) I don't remember - again my group house ruled that issue also. Abortive actions: defensive actions only, at the cost of having no other actions for the turn a character may declare a dodge, movement dodge, or a block at the beginning of a turn set. If the character had only declared a single action for the turn then the inaction extends into a second turn.
Phoenix...
"I'm not saying there should be capital punishment for stupidity,
but maybe we should just remove all the safety lables and let nature take it's course"
"A Place For Everything & Nothing In It's Place"