Below is a list of features that I think should be added to the game. Please add your ideas in the comments.
- Customizable logos on modules and capsules
- RCS module for space stations
- Robotic arm and attachment points
- Custom parts
- Accurate connectors: connectors are attached to the stage below them and detach with that stage
- Control room can make all attached modules' engines fire together to simplify maneuvering of exploration stations
- Saving rocket designs
- Relaunchable and relandable landers
- Landable and relandable draco capsules.