I would LOVE to see us be able to add allies one day. The ability to make an agreement with a clan in menu selection form to where they can enter our bases (but maybe not open our chests) and our thralls would not attack them, doors would open for them, etc etc.
Also, Id like to see pin coded chests. Even though I love my clan mates, I do not like sharing all my hard earned stuff with everyone at all times lol. Id love to just be able to lock a chest and have it so nobody, not even my own clan, can open my chest without my pin code.