i will try to be clear but i have been known to add confussion, but i will try my best.
1. I am not entirely sure which battlestation actions cannot be done remotely (at a penalty of -3)- sometimes it is stated explicitly, sometimes it is not. For example: can the engines be pumped remotely? Can someone list all the battlestation actions which cannot be done remotely?
the engines can be pumped remotely.
can not be done remotely: Healing, repairing modules, bots, and equipment, recofiguring the cannon, lauching a fighter, and hacking an battlestation or hatch.
2. Most of the pages 50 and 51 are totally unclear to me (the part about what characters can do onboard a boarding missile): What's the difference between the action on page 50 under "Hits against a Boarding Missile", and the action on page 51 beginning with "a character in a missile may...". Can someone give examples which clarify the distinction between these two actions?
they are just restating what is said under Hits Against a Boarding Missile p. 50
I don't understand this sentence on page 51 at all: "Characters aboard the missile may take an action to choose where they go such as changing targets or remain in the same hex."
a normal missile is fire and forget and you need to choose a point or object on the map it is going to. a boarding missile does not have a guidance system, it is controlled by the character(s) in the missile. so if they want to change targets in midflight they can choose there own course.
3. Is the reward of 100 XP for a completed mission in addition to or instead of the 50 XP for an attempted mission?
in addition to the 50 XP.
i hoped i helped out. stay well.