I came up with the idea over three years ago, on vacation, drawing tanks, commanders and other SciFi stuff. I wanted to make that mod, but when I returned, Planetary Annihilation was announced and I forgot about that.
So, let's imagine, that commander can't be teleported directly into planet surface, because of gravity well. Instead, its teleported somewhere into planets orbit in drop ship and then land on the surface. I don't want to add that animation or transport ship, idea is about something else.
Now, at start of the game we have 2 units - commander and drop ship. I want to be able to use that ship and convert it into any T1 factory anywhere on the map. It will work like a drone, that can only build (for free) only t1 factory. Converting will take like 2-5s, and drone need to fly there.
This can change a lot in game. What we do on start of the game right now? We build factory, some simple build order, "GL HF" in chat and then we wait for factory to finish. After many games I see that I usually wait for about 20s doing nothing, just waiting. This can speed up begin of the game. We can build mex/pg/hydro faster. Also it opens the way to new strategies, because you can drop that factory somewhere else on the map.
I don't have time and modding skills to test that idea, but maybe there is someone who knows how to do it.