"drag and drop" and the cmd-key

My Situation: 2 finders open, one pointing to a local disk, the other to a remote disk.

If you drag (using the cmd-key) exactly one file from that "local finder" to the "remote finder", the meaning of the operation is "move".

If you drag (using the cmd-key) more than one file from that "local finder" to the "remote finder", the meaning of the operation is "copy".

How do I achieve a "move" for more than one file?


Update 2011-07-23
Starting with Lion you also achieve moving more than one file like that.