At the moment I use routes to delineate the border I agreed with a massively bigger ally. It avoids me accidentally breaking our agreement, but it would of course be very useful to have a way to draw up something like that for the ally to see too. If it is an idea for the game it would be nice to have that as a separate option too thought, as I also use routes for other info now, which I don't necessarily want my ally to see.
I do the same thing.
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"A neutral humanism is either a pedantic artifice or a prologue to the inhuman." - George Steiner