Although the Control-drag function in XCode does not work over VNC or remote connections, one of our clients, David W., shared the following workaround with us.  It is not a complete solution, but it will allow you to make some of the same connections without dragging.

Please find the solution here:

http://www.iphonedevsdk.com/forum/iphone-sdk-tools-utilities/49669-cant-control-drag-via-remote-desktop-interface-builder.html

Many thanks to David for sharing this!  If you have discovered solutions that we should know about, please let us know: support@coderebel.com.