I didn't mention minigames - I've never played Space Rangers, so I can't comment on that...
The idea of personalised species tech trees would work quite well, especially if you can still trade tech - the game would need to be coded to deal with it, e.g. Humans could have something like "Drop Pods" (soldieringability + 20) and the Arceans "Genetically Modified Food factory" (food + 19mt/wk), and you could trade them, but it'll cost double the amount, because it is a tech that each species wouldn't normally have. It shouldn't be that hard concidering what age of gaming we live in. It's not like the good ol days of the Amiga now, with those tear jerking graphics and characters who walked about with limbs moving at 90* angles.
I don't think it would weaken the game at all, so I would like to see someone make a poll (someone with a website, and who knows how to do it), and stick a link to the poll here.
All those in favour can say yea, and those against nea.