(When we upgraded to 2012, I thought we had the ability to do this, but lately it seems broken.)
I'd like the ability to open another model, that's linked into my current model, without having it unload from my current model.
This is helpful when I'm working in RST and I need to open the Architectural model to look at their work, or grab their title block. Or, when our project is so large we've broken it into several buildings; thus, several models, but have them all linked together.