Thanks. Yes, my plan was to, in the Bio, say .. "born in Enfield, Massachusetts (later Connecticut)" .. with the "later Connecticut" linked to the free-space page explaining the situation.
And .. thanks, yes, "Massachusetts Bay Colony" .. right!
Interesting about the location suggestions, so that's a web service provided by FamilySearch, hmm. I'll definitely contact them about adding these other places. I need to figure out the correct county (or counties), if any, for these towns when they were part of Massachusetts. Been looking for old maps that might indicate, but nothing yet.