In addition to more flavorful followers, I would like for them to be commanded by a helpful command system. For instance, you can tell followers to stay passive and to not engage enemies unless either you or they are attacked, order them to stay in a spot you point at, make them focus on a single enemy during combat, and even command them to take items, pick locks or decrypt computers if their skills are high enough. All without having to get close to them to initiate the feature. Since certain situations would make it dangerous to walk up to companions, it would be great to have the ability to command them from afar.
I also thought it would be cool to have a relax command, where the followers would go around and interact with objects such as food, tables, chairs, other NPCs, ect.
New Vegas was heading in the right direction with follower commands, so it would be nice to see it improved upon