Potentially make a category involving both the Rebel and Empire Story modes combined into one run?
Usually when campaigns have continuity with each other, like Warcraft and StarCraft, there's a whole game category, otherwise they're treated separately. Real time strategies usually don't have something close to 100%.
On a side note, there's an RTS Speedrunning Discord server, if you're interested: https://discord.gg/dy3GRjw
I'm not too crazy about that idea, as it doesn't really add anything extra to doing the campaigns. The same exact strategies would be used as if they were done individually, so I don't really see the point.
Now, a miscellaneous category that I have been toying with the idea of adding is all galactic conquests (would be sub-categorized into the EaW and FoC conquests). The reason why I say all in one category is because some can actually be beaten in ~1 minute. Also, any rules would be allowed for them, would be cool to see which of the many options available is best for each one.