I also like the icon, although the “cannot dock” icou should be more like X than what is it currently as both icons right now looks very similar.
The colorcode is great. I don’t understand the negative comments, how can you mistake ship with citadel??? The color or the icon helped me to esily identify my enemies structures without need to check each citadel manually. However, I think there should be no icon color by default - it is now confusing with any corp you set at 0 standing. So by default there should be no color and the gray color should appear only for corps set to 0 (gray).
As for position, I didn’t notice any changes. Neither do I see changes when someone is sitting in citadel. Afterall, whether someone is or is not in it was always visible via the end bracket with number [0] (nobody) or [X] (x ppls inside)