Not an action so no effect is my interpretation.
The EPT must be an "Action" one for the ability to kick in. I don't see where the doubt comes in. If the EPT isn't an action then there is no action on the upgrade card for other ships to perform.
Usable EPT's at present; Daredevil, Expert handling, Marksmanship, Squad leader,
Daredevil is asking for trouble due to no boost unles you put Youngster in an Interceptor mini swarm.
EH seems like it could be awesome if you have Carnor around. Denying use of Focus forces TL's which you then EH away.
Marksmanship is still a bet meh I think due to no defensive help but spread across a whole swarm could cause some ouch, though add in Wampa being able to benifit and drop a damage past shields...
Squad Leader is already covered in the article.
Don't think I missed any action EPT's?
Expose
Doh, though that is mentioned in the article, I'm not sure I like its use any more than normal. Howlrunner helps bypass the usual issue with it to a degree but I'm not sure I like its use due to the agility penalty. Ties die so **** easy as it is.