If you have a lot of custom factions, you don't want them all the be the same few map colours. So I went through and created a mod that added in some (well, quite a lot) more map colours - all using existing colour definitions, just making them selectable in custom faction creation,
The trouble is, the dropdown box has a limited length. For such a moddable game, it should be prepared for users to add in many more options. As it stands, I can't select some of the colours.
http://steamcommunity.com/sharedfiles/filedetails/?id=430342142
All such dropdown boxes, but especially ones like that, should have a scrollbar, or at least be navigable with arrow keys.