Settings.txt allows you to set the maximum and minimum values for the characteristics of reproduction and environment resist.
Set the max and min both to 100%, and you're set.
Biggest loophole: Organic tech's reproduction bonus and replicant facilities.
Score calculation issue: Players will have to give you their passwords, or turn off their password for the Last turn. This will let you load their turn, and count up all of the people they have stashed away on bases and ships as well as planets.
You might want to have the captured, alien population be worth more than the homegrown variety...
That would make the leading player a very inviting target for a quick boost in score.
You might also consider disabling weapons tech and shield tech.
Then players would have swarms of capture ships and troop transports roaming the galaxy stealing things back and forth. Ramming ships could be the only defense
Also, many vehicles (such as population cargo stations) would sport security stations to limit their vulnerability.
[ October 07, 2002, 17:25: Message edited by: Suicide Junkie ]