I would like to see the ability to assign allied community members to a real base and help build up their base for them. It could also help with the players current base, giving certain boosts. If you build a farm on the allies base, you get a percentage of the food made.
Another idea would be you could also give away a community member to help run their base. Maybe having a friendly community, give the member to their community and it is instantly an allied community. Or if you want to get rid of a member but not just send them out. This way you can continue to see them on that current map.