Hummm, I wonder if the "Introduction of Errands" might play a role in this. Take a peek at your Game News.. Looks interesting. TiGeR
I see this is an old thread. Midoki said it was something they were looking into. I've currently got 3 lazy builders watching their colleague work himself into an early grave building a pirate hall single-handed! Did this idea get discussed elsewhere since and dismissed? Would be great to be able to get builders to work together. Is it old news?
I too like this idea - but I see that the potential disadvantage to gem revenue has been noted... Perhaps a way this could be implemented (without significant disadvantage to Midoki) would be that each additional builder costs the object's full build cost again?