I'm trying to use LR4 to work on NEF images I'd imported from a read-only directory. While regular LR4 editing works, using an external editor doesn't because LR4 insists on trying to write a file into that read-only directory. Is there a way to persuade LR4 to put the files it uses to communicate with external editors somewhere else? I intentionally want to keep my NEF directories read-only because they're synced with other programs (which would get upset by LR4 sneaking extra files in there) and because I don't want to accidentally alter anything there.
