I would like to see up two or three mutually allied players be able to “share” a victory.
As it stands, if an alliance is very tight, the game functionally ends the game when the alliance has got 51%, but the other player/players have to endure mopping up just so one player gets to the victory threshold.
There are multiple ways shared victory could be done, but it would have to be voluntary (i.e. no accidental shared victory when you wanted it all) and limited (maybe 2 victors on 6+ game, 3 on 10+).
Personally, I’d say no-one gets a “victory”, but they share the rank for first and second or first through third.
Mostly I’d like this to prevent the long inevitable squshing of the last few smaller players. It’s not much fun for them when they’re already in the minority, so they really have no chance. (And I figure if the allies are willing to accept no-one getting the victory, then that pretty much means they’re committed enough to have next to no chance of the alliance falling apart (which is the only reason to force the end-game to be prolonged.)