Proposal:
Each sector on the map would have an indication of what country the sector "belongs to." That is, who owned the closest base it at the start of the map.
Possible Implementations:
Dynamic - The sector numbers would be colored the same as the enemy base icons.
Static - A colored border around each sector
Goals:
1- More immersion. Players would be fighting for "their" territory.
2- Help curtail round-robin base-taking, where Bishops take Rook bases while Rooks are taking Knight bases &etc.