Seems to me that it would be realitivly trivial to write some code in .NET to parse the downloaded data, store some local points and generate a custom included set. The only problem, of course, is that they would not update until you camped out. There is really no way to do dynamic updates of user created data. It's either in the file when the game loads or it's not.
Not, mind you, that I'd like to write it. I figure I'm using the map so I don't HAVE to set the points. OP, I'd say that unless you find a developer who "gets" what you'd like to do, you're SOL.
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