In an answer, no.. I'm guessing the game has no list or flag for colonizable planets:

wirsz.phpwebhosting.com/s...s/test.jpg

(this is the closest coloniziable world BTW)

The game apparently doesn't have a fixed table of colonizable planets. I'm guessing it evaluates them dynamically, especially to give the "reason" in starport for your failure.

Just changed on digit for planet 1 of 34,71:

original setup: 0F (medium frozen)

Frozen - 0.95g - very thin - arctic to tropical - none
5x10^21 - 0% bio , 67% min
nitrogen, oxygen
water
molybdenum
antimony
aluminum

changed to 11 (gas giant):

Gas Giant - 12.90g - thick - arctic to tropical - violent
1x10^23 - 0% bio , 67% min
fluorine, chlorine
water
molybdenum
antimony
aluminum
_______________________

Very interesting.. Make that temperature range, (based on orbit & stellar type?),

%bio, %mineral = fixed?
hydrosphere, lithosphere = fixed?

I guess all other values are relative...

As for my idea, remember that Starflight is several games based on top of each other.. Since your first goal is to outfit your ship and gain money through trading, just by changing two things:

-> Fleet locations
-> homeworld locations

It would seriously make Starflight II a new game as far as the trade system works. Trade routes would be completely different, star exploration would be necessary (with a system scanner, or a list of "homeworld systems" to make it a bit easier)