Sole Soul - thank you very much for the links!!! Map generator is indeed a very nifty tool that greatly expands potential gaming scenarios.
Your previous suggestion regarding adding "cheat" to direct shortcut vs. launcher’s shortcut was right on the spot - I spend past 6 hours opening maps, generating all planetary and mega events, etc - plain fun. I also can confirm that game's default relative probabilities for different hostile environment planets are equal. Data for 61 hostile planets collected from several generated tiny galaxies:
Planets %-age
Aquatic 14 23%
Heavy G 12 20%
Toxic 11 18%
Barren 10 16%
RadioAct 14 23%
Standard Deviation for this Binomial Distribution is 3, which makes about 5%. One can see that none of the %-ages deviate from 20% (equivalent to equal weights of 1/5 -> 20%) by more then 4%. In hypothesis testing language one would state that each type's probability difference from 20% is not statistically significant, hence all equal to 20%.
The cool thing about map generator is ability to change those relative weights, thus altering game balance to one's liking.
My initial experience with no Barren planets was due to normal stochastic fluctuation (there were only 4 Barren planets out of 26 hostile ones) and my choice of "tight clusters", which placed all Barren planets in one quadrant. Later regenerations with equal spread resulted in a much better mix of hostile planets through galaxy.