You can have multiple specialities for a skill (although only as many as you have ranks in that skill, unlike Shadowrun as best I can tell). The list is mostly constrained. There are two skills which let you specialize on a particular location, so it could be taken multiple times, with a fill-in box so that, for example, a character could have specialties in Xenobiology (Terran) and Xenobiology (Nofran).
By the by, knowing now that you did all of the other systems in this tool, I take my hat off to you.
