Then i must mention this: when i move my mouse around to highlight different hexes on the ground, the hex-highlight color is red. Red is very dark so in many cases in this dark game, it's not easy to see where my mouse is.
Now imagine you go into TC like that. You zoom as far out as you can to see as much as you can, but all the details get smaller as you zoom out. The smaller the details on your screen, the more easily you totally lose where your hex-mouse is. Not much room for error in TC, so yeah, if this could also be a customized color, big improvement.