[Suicide Junkie]

quote:

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It should take longer than one turn to conquer a planet, unless its nuked from outer space.

You can mod that. Increase strength and numbers of milita, reduce ground combat rounds to 1.

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P&N does that in some Versions.
One militia for every 2M people, and the militia get 1 attack/30 defense points.

Battles are commonly over a year long, and if the defending race is emotionless, they can continue to build reinforcement troops while they fight.
(Non emotionless typically start rioting after a few turns)
This provides plenty of time to counterattack the enemy, and drop reinforcement troops for either race's side.

Small worlds and small numbers of attacking troops (5-20) can fight to a stalemate indefinitely under these rules.