Hmm, what if it was something like:
"When attacking, you may modify your dice after your opponent rolls their defense dice."
So you can roll attack dice, leave them as is, opponent rolls their defense dice and have to modify based on what they think you'll do. Then you can choose to spend your focus if it would actually result in a hit, or bluff them into spending all their mods on a single roll.
Oooh... I like that. Taking it one step further, how about something like:
"After declaring the target of your attack, the defender rolls and modifies his agility dice prior to rolling the attack dice. Then receive one stress."
Having the greens go first would be pretty sweet. Against someone like Fel, you would be forced to spend tokens to maximize the evades, assuming that the attacker is going to get full hits. And against someone like a Y wing, you'll know how many hits you need prior to spending/wasting that focus that you could have saved for defense. The stress prevents it from being too rampant.
Who receives one stress? Ok, when I first read that I though the target of your attack received the Stress as well and while that isn't what it says I'd bet you get plenty of people who read the period as a comma which totally changes things.
Forcing a target to complete Defense before starting the Offense is a LOT stronger than simply making the target roll defense before any modification, to attack or defense, take place. Having both rolls before any modifications is going to be worth much less than finishing the defense before an attack is even rolled. She may not get an EPT but imagine Miranda's ability when you already know what the defense is going to be!
I wonder if this is an appropriate ability for a 4 point EPT:
"Ships attacking you skip the 'modify attack dice' step of the attack."
Putting it another way any ship attacking the ship with this EPT must do so with naked dice. Not so strong is "simple" play but when you get to tournament play and the chance to have two or more modifications to dice it would become very strong.