The "Empire of the Smoky Skies" scenario has a unique tech-tree (complete with unique units and buildings), unique social policies, unique leaders and unique victory conditions, as well as forced game speed and forced starting era.
Is there a way to play a game which uses only some of these elements? For instance, can I play it starting from an earlier era, with a different game pacing, and with standard social policies, but with the same tech-tree, leaders and victory conditions? Or play it with standard leaders, but all the rest remaining the same?