Another note, it's probably going to be rare for anyone to actually click the buttons. They are more there for feature discovery, after then people will find out they can hit a hotkey instead of clicking the button.
I expect most will forget that "L" toggles flags (I forgot it was a hotkey until I saw it in the source code). Flags I suspect will get turned on for those that like it and probably rarely updated again.
Last comment, the locations of buttons is slightly civ inspired, but again, really curious if there are good suggestions for alternatives.