A scenario editor is also provided that can be used to create new scenarios. The editor is open source and available at: https://github.com/D-Pointer/imperium-editor/ It requires Qt 5.x but no other libraries and should be quite trivial to build. Scenarios done with the editor can be opened and tested with Imperium.
OSX version (built on Yosemite):
There is no binary Linux version, but it is easy to build.
Using the editor
Including scenarios in Imperium
If you think a scenario is good and you would like to have it included in the real game for everyone the play, please contact me!