Just wondering whether there is a simple way to disable AI surrender, so that the game ends when the final enemy planet is nuked.

I know that it's possible to continue playing after the AI has surrendered, but it's just not quite the same (and the AI doesn't seem to react in the same way). The surrender can be quite disappointing in large maps, where the AI might have 10 or 15 planets left. I also like playing 'against the clock' with particular configurations of AI on large maps, so the surrender adds another unknown component.

Anyway; is there is a simple way to disable AI surrender, or otherwise adjust the surrender parameters (to achieve the same effect)?