I loved Galciv, but there's one point in the game that I always disliked... And I bought GalCiv: AP just to be able to come here and post this message. ::grins::
I'm begging you... Pleading with you...
Please have more techs that have some sort of non-numerical ability tied to them.
As it stands, there were only a handful of techs in Galciv that did something special. You could research how to talk to other races. You could research diplomacy options. You could see all the yellow stars in the galaxy. You could build Terror Stars. But what else? All the other techs just added numbers to more numbers, and the tech tree was muddled down with duplicate projects.
If the tech tree had more techs that did something unique and important, I'd pay more interest to it rather than just falling into the habit of researching the cheapest item available.