I use "Start as Minor Civ" because I see the early tribes that have spread out as competing for the land around them without actually getting into war, and the AI with Minor Civ active doesn't really wage full scale war despite being "at war".
A player could take advantage and try to take out other civs completely I suppose, which is why a "supply line" option would be good, not being able to actually go too far so only the very closest ones could be taken out anyway.
The game also lack any way to effectively negotiate over an area not previously settled, leaving it to whomever either massed up palisades to culture claim the area (or "claimed" with later functions) or was the first to force a settler to the area.
It's always annoyed me when other nations go far from their own territory to settle right beside you, for me that's basically an act of war. With Minor Civs on at least one can fight about it without needing to have a full scale war or fight to the death.
Simply put by having troops there and trying to stop settlers from coming through, while they try to get their settler through.
Thinking about it maybe the AI should have some kind of insight into that too, and send "push back" or "push through" units along when trying to go to a "contested area", a place they go closer to others ready to fight for a resource?
Anyway, long iteration on why I use Minor Civ start, but changing the changeover to Negotiation instead of Writing probably is a good idea, it does take a little too long to get to as it is now, yes.
Cheers