I believe I mentioned this previously when suggesting it for loading saved games. But there are MANY places where double-clicking would sure come in handy. Such as on the GNN screen with planet improvement summaries. Double-clicking the on the announcement for the planet should take you to that planet's production window as an option to clicking on the "go to" at the bottom.
Same for loading saved games. Same for navigating in and out of the planet/fleet listing screen. Double-click takes you to that planet's production window.
I realize this isn't a bug - but an enhancement. Wonder what others think of the idea.

I hate to sound like a broken record - but - I wanna end by saying THANK YOU to all the folks who brought GalCiv2 to life. Its like the old slogan from the company "GE"... "You bring good things to life!"