All zones have three levels - 1. No border around zones with <99k bots, 2. Half border around zones with 100k-999k bots, and 3. Full border around zones with >1mil bots. These levels are helpful for having an idea of which zones around you might be easier to attack, or which zones that you have control of are more secure. However, there are many cases where these levels are unhelpful. In heavily populated areas for example, all of the zones around usually have over 1mil bots, and therefore have the same border. For this reason and many other possible situations, here is what I propose:
Allow each player to set their own custom levels for zone borders. This would still be limited to 3 levels, but the cutoffs for those levels could be changed. For example, I could set the levels so that all zones <1mil show up as no border, all zones between 1-2mil have a half border, and all zones >2mil have a full border. In my area, this would show much more variation in the zones around me, and it would give me a better idea of what state the zones are in. Really, the optimal levels would depend on where each player is located and what their goals in the game are. I think this would be a nice way of allowing players to improve their gameplay strategy even further.
Let me know your thoughts!