The custom part means that the behexed artillery come from a time when a region had set recruitment centers and that was it. They were placed by Tom, and no more RCs could be built or torn down.
Yep, and all it truly indicates is that they are unique and irreplaceable (well, and great stats). The special abilities are still, and likely will forever remain, conjecture. The Behexed Artillery just always seems to get most of the attention.
I thought someone in another thread had mentioned cavalry on the East Continent that got destroyed. What did people think was their ability? (Also, it's too bad we can't even get confirmation on dead centers... because it would confirm that SF have abilities at all.)
EDIT: Oh, yeah, we should probably get back to the topic at hand... Even without SF abilities, what's the likelihood of introducing a bonus from sea to maybe MI or a new unit type? (I suggest MI because it seems under-utilized and is already a specialist kind of unit.)