As LagMaster said - no. Cities means cities. Or, if you love details, specific city maps (that's why Hub Oldtown was camp area for some time - for some reason this map wasn't originally added to list). If i can put private opinion on that, NCR mine should have reinforcements with higher delay than normal (even in cities they never come to map instantly), and maybe Junktown too (but limited - high tier stuff just don't fit there). As for now, this maps are not on list.
About Klamath mine, i don't think reinforcements there are good idea - it's city of farmers, not warriors, after all. In perfect world, keeping Klamath mine safe should be up to faction controlling Klamath, but we all know that nobody from gangs cared about it, and i'll be suprised if they do - it's easier to do in Broken Hills, where guarding crafters is just part of guarding city duties... Klamath mine is specific, cos it's separated location.
