Adds modular buildings. When placing certain buildings near each other, they "combine" into a larger single entity. Can be used to reduce UPS overhead in larger bases.
It would be nifty to replace the merged entity with the component original entities when you create a blueprint; I believe that, for example, better bots technology, does so, and could be used as an example.
Yes, I'll have to look into that actually. I'm working on a blueprint replacement script for another mod I have actually. I think I could use what I have in it so far to fix this particular mod.