I can confirm the code for making bigger nebula works well. I have found so far one large nebula cluster and I'm not sure how big it will be in the end and two seperate nebula systems I've not yet surveyed. I was a bit concerned the tech gain by scanning wasn't working but finally I started getting data on the gate.
As far as instant gratifaction goes I'm 47 or so years into the game, and have about 10 years of research in the queue at the moment even with 20 facilities and a +30% govenor. I'm starting to hurt for duranium in my stockpile even though I have sources of it all over the place its just a question of building up sufficient mines when I can afford to build not many automated mines per year (primary homeworld duranium production is 2400 per year at the moment). My problem is that on my one easy to reach colony world the deposit is huge but with a low availability, so in both cases I have to use automatic mines on a nearby rock and mass drive it to them. I may have to take a breather for 5 to 10 years and just slowly build up my colony facilities.
I have found a use for anti-greenhouse gas, filler with N2 for some atmospheres to keep the temperature down to comfortable. The Draak like so low a pressure though that its likely I'll have to accept that some worlds will just require domes regardless. What is crazy is that the civillians have been dumping infrastucture and colonists on my one x16 colony site and far less on the x4 colony site where terraforming is far closer to actually doing something (adding greenhouse gas currently and then I'll start removing H2...the H2 is currently about 80% of the atmosphere at 0.4 atm). But its been a big achievement that both of them are just barely breathable in terms of 02. I have to play with the atmosphere of the other colony worlds some, one needs more atmosphere in total and more 02 the other just needs some greenhouse gas to bring the temperature up, but its a heck of a trip to that colony and my terraformers aren't fast enough to give them a long time on station.
Some questions further:
Is there some way to mothball ships?
Also why do PDCs cost maintenance on my homeworld and no maintenance elsewhere?
For maintenance costs in terms of minearals do they have to be present on the planet itself? What happens if you don't have one or more of them?