MrHolly of the Discord server brings up a good point: if you cancel the Marine keyword, you could load an enemy Marine onto your ship to make them part of your fleet.
Though not technically a “capture”, maybe still worth a mention in a future PC update.
Ex: “In order to capture a Marine, you must use one of the following methods:”
It is correct, but I’m hesitant to make a list of ways to capture them because there are a few other ways to do it too, but only the cancellation is unique to Marines. Maybe just a not specifically mentioning that it’s allowed, without a full list.
How late in the boarding process can you reveal a boarding bonus crew? (such as +1 to boarding rolls) Can you do it after both players roll their dice, or must it be earlier such as at boarding initiation or before dice are rolled?
If it adds to the roll (+1), it should be revealed before making the roll. A reroller can wait until you actually want to make a reroll. Abilities that trigger when you win a boarding roll (kill all crew, steal all treasure, etc.) can stay hidden until you win the boarding.