This is a very good point, especially since we are likely to fight trolls soon. I really don't want to give this project two more actions, though; next turn we need to learn Invisibility (1 action) and talk to our new friend (1 action). I would also really like to do the "investigate how the We communicate" action so that we can, when writing the book, get every possible breakpoint (right now it's missing that).
So much to do, so much to see, so what's wrong with making your doom fortress only extremely killy instead of arbitrarily killy?