From: Australia, mate
It totally could. Although you'd clutter the tech-tree significantly. I've been thinking about this myself for one of my own mods, and I'd already come up with the following:
For race types native to continental/marsh, your tech tree would look exactly the same as it does in vanilla. This'd make their colonisation options much easier. It'd get progressively harder as you approach either extreme.
Desert would be:
Desert > Continental > Marsh > Water > Ice > Advanced Colonisation (requires lava colonisation as well)
Ocean would be:
Ocean > Marsh > Continental > Desert > Lava > Advanced Colonisation (requires ice colonisation as well)
It's slightly harder, but it's not too difficult. What's hard is the tech-tree of the races at the extremes. You can reach more exotic planets quicker than continental/marsh races, though.
For the extremophile races the tech-tree is a straight progression from one end to the other, with advanced colonisation coming after you've researched the last tech.
Ice < - > Ocean < - > Marsh < - > Continental < - > Desert < - > Lava
For limiting access to each tech tree, all I'd do is make each line restricted for the races that it doesn't apply to. I'm not sure how well this lends itself to having all planets unlocked from the start though, because all it'd do is improve growth rates.
If it's possible to double the population growth rate of a planet twice through technology, one thing that could be done is adding two tiers to each colony tech which you have to research in order to start on the next planet type. This would be balanced because the road to reaching advanced colony tech is exactly the same. I'd just have to switch around the research costs of each tier so that each line works out to be the same value.
< Message edited by ChildServices -- 6/5/2014 4:55:20 AM >
Alexander the Great, his name struck fear into hearts of men.