There's a couple of things I would request/suggest to improve the tech tree AI:
- Allow multiple techs to be queued - currently, if you want to pick a specific enhancement in a tech path, you can't select anything past it. If you click on anything past the enhancements, you don't get to choose which of those enhancements to research. It would be nice to be able to Ctrl+click to queue multiple techs.
- Remember expanded tech tree setting, and/or allow it to be set as part of the game settings. I always want the expanded tech tree, but every time I save and reload, I have to re-set it again. Its a minor thing, but a little annoying.