[dmm]

For binary systems, the game could allow travel from one sector to the other without warping. Of course, in that case, if one star went nova it would need to wipe out BOTH systems.

I didn't realize that the temperatures go down with distance as you say. But that doesn't affect gameplay in the slightest, right? Could one, in principle, set a formula for conditions so that planets with nice conditions would always be located within a "habitability zone"? Then conditions would automatically be bad for frozen or scorched planets.