I would like to be able to open a central file with all links unloaded. This is especially useful when upgrading files to a newer version so you do not have to wait while all links are also temporarily upgraded then go back and upgrade the links again individually. If you code the version of Revit into the file names you have to rename the links anyway when you upgrade them then go back to the central and "reload from" to switch to the newer version linked file. If your files are large, upgrading the main file as well as all the links in the same process can crash if you run out of RAM. Being able to open and upgrade the main file separate from all the links solves this issue.