Currently, sentries do not fire on empty subs carrying a specialist.
If they did, and the sentry still targets the sub with the greatest number of drillers, on could still employ this technique; send off a sub with more drillers just ahead of a sub with no drillers and a specialist.
I wonder if it would be useful to be able to kill a specialist in a sub as well. I realize the above situation is just as easily employable, but it it just feels off to send an empty sub with a specialist nonchalantly through a sentry's firing range.
Thoughts?