10x the number of tiles?  So you want 400 tile planets?  You're basically asking for each planet to be it's own 4X game.

I've heard that they are implementing ground combat in the game at some point so the addition of more tiles would be a great asset. If they're implementing a new feature they might as well do it fully formed, with enough strategic depth to be interesting.

Besides, a 400-tile planet would be roughly 12 x 33. Perhaps a bit large, but still manageable and allows for better use of adjacency bonuses as far as clustering is concerned.

Not on a 2,000 planet map it won't be. Besides, 35 to 40 tile planets become monsters the mid to late game.  And a 50 tile one, which  I think is just about theoretically possible*, is damn near game breaking. 

Don't get me wrong, as a person who used to mod GC II to take advantage of all the planet quality techs, the more tiles the better.  But, honestly, after 35 to 40, they just become silly powerful with enough population and buildings/starbases.

* The theoretical maximum planet size is 63.  But the coding has it so tiles map semi-roughly to the land masses that are auto generated.  Still, with the right ideological traits, a little bit of luck, and a whole lotta tech, I can see a class 50 planet being generated once everything is done to a planet that can be done to it.  Again, theoretically.

Quoting RSharaE,

reply 6

It's pretty easy to mod the xml so that Biospheres is reusable

Shhhhhhh.....

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Actually, making Biosphere reusable is too much, even for me.  But if things stay as they are, I plan on making another couple of techs for some of my local games that will mimic what Ultra Terraformer does, but for the other three terraforming techs [that is, all of them EXCEPT  Biospheres].  I plan on making them cost a pretty penny and only availiable after the tech that grants Biospheres/Ultra Teraformers is researched.

So when I have the itch for crazy planet quality maps, it will be in fact scratched.