I have heard of, but not played with, a setup where you RDP to a workstation near the server and checkout files. Then FTP the entire .proi folder to your remote site to perform the work. Reverse the process to check files back in.
Folder structure would have to be the same for local and remote workstations. You may also want to beef up the network connection (Riverbed Technology?).
Not the most elegant solution but it could bypass a lot of IL frustrations.
-Ter
Terrence (Terry) McFall
CAD Systems Administrator
Varian Medical Systems
911 Hansen Way
Palo Alto, CA 94304
650-424-6039 desk
650-799-0179 cell