Took me along to figure out how to make the custom list of "assets" when your skirmish loading screen loaded. Along with the generals portrait. Eradicator finely told me. It's all in the challenger.ini. Not so much the playertemplate.ini. IF you are adding new factions, in challenger ini you have to assign the new factions a challenger persona to add that stuff. Check out
ModsRus for a chance to ask some of the best how it's done. I love pimpin' his site.
(Located in player template.ini) DisplayName = INI:FactionIran add a new string in the csf file for the player template for your new faction and it will show up in the skimish drop down list.