Could you explain in what respects? Is it footprint size? limitations in object counts? What are the limiting factors? I'm sure this would make a great topic at the con and probably far easier to explain in person. The reason I'm asking is just like skins, this looks like a way where the community can truly help you.
No I can not, but I can give you a few examples.
We will be changing the way the strat system works soon. To do so we will be moving and replacing factories and possible other objects. With custom objects this becomes a much larger volume of work.
We spend a fair amount of time making sure main arena terrains work. With custom objects it because a very large effort to check things, which would now include things like frame rates, buildings that can be hidden in along with many more.
The things you can change is some texture items.
HiTech