Once we get some tech category icons, we might want to
colour code tech categories on the Research screen.
Each category could be assigned a colour, and the tech
boxes in the tree views and in the queue would be drawn
with background and border of their respective
categories. This would be a great visual feedback
mechanism to reflect where the player's research
This probly needs some forum / art team input, but I
liked it so much I'm putting up a feature request so I
don't forget it.