I'm kind of hoping this is news because it's really got me excited. Okay, you know how you make a Static Collection, right? If you don't, you simply select all your objects that you want to be a solid piece and hit CTRL+G, and voila - you've got a Static Collection. It looks, acts, and behaves the same as a regular mesh.
Now the cool part - bring up your Fallout directory and search the meshes for an SCOL folder, and a new mesh should be in that folder - the combined mesh you just made! And it's as manipulatable as any other mesh. It's freakin' wicked!
I did search the GECK wiki, but I didn't find anything about getting the mesh out and using it for whatever your needs. I hope this is something handy for y'all. And many, many apologies if this is old news.