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I will start by quoting Nuclear on our previous discussion:
There is a piece of wisdom about research rates: since tech costs in Aurora scale exponentially (roughly 2^x), there will always be a 'wall' you hit after which advancing in tech is a very slow process. Changing the research rate speed only changes the point in the tech tree where that wall is hit. With the default 100% that wall might come at, say, solid AM tech level, while on 20% research the wall may be at MP Drive or Magnetic Fusion tech levels. However, there will be a wall either way, all the tech slider decides is what tech level the wall is at. If you want to play 100 years at NPE tech, then you can set research to 5% as long as you are comfortable with the implications RE: NPRs and spoilers.
The research will inevitably slow down at some point if you adhere to the admin cap, as there is only a limited amount of labs and RP that can be generated per year, even by the most gifted scientists. Additionally, this is a benefit that can only be enjoyed during the later years of their lives, making it a temporary bonus.
I think we should aim to distribute research evenly or at least gradually, with some key technologies being more expensive and others slightly less so as a direct consequence of initial efforts. Unfortunately, this would require the creation of several intermediary technologies, and the Aurora tech tree would need to be rebuilt from scratch, something Steve may need to outsource the design to a forum group or panel as it cannot be redone in-game during testing. You have this partially due to components, engine/power plants connection, and some other intertwined techs and branches. Perhaps it could be expanded? I seriously doubt he would consider it anyway, as the amount of work for little to no gain would likely not be worth the trouble. Also, the changes could involve several other part of the code, making it even more difficult to implement.
Regardless, I am happy that research is getting back on topic and the usage of TN resources is on the table. Personally, I agree incorporating minerals that have had less utility into the equation adds an enjoyable twist to our challenges without causing too much micromanagement!

I would also support using wealth on a larger scale in the process. To elaborate, in a recent campaign's early stages, I have 48 million scientists generating 120 wealth per year per million. My research expenses during this period were approximately 8.5k. Essentially, the cost of my research labs and efforts to taxpayers was less than 3k ((48 * 120) - 8500).
Maybe it's just me, or perhaps my equation isn't correct, but it seems too inexpensive compared to how much R&D functions in the real world. Additionally, as Wealth generation technology advances, the impact of wealth on actual research efforts may become completely irrelevant, which is likely an overlooked side effect of the current wealth balance. I'm not suggesting we break the financial model, but if some are concerned about slowing down or unintended consequences from overly ambitious research, financing could be a solution, along with the already suggested mineral usage.
Finally, I would also welcome random events that could advance or degrade the project by a random percentage from time to time. This will make the research timeline even less predictable when combined with always possible unexpected deaths.
Just on a personal note, I have seen many great ideas, but please, while formulating them, bear in mind that everything still needs to function with the NPRs' AI as well, or we may encounter larger issues than expected.
Of course, Steve knows this better than we do.