I'm afraid the above suggestions will most likely not work, since you're wanting to transform the full absolute path on the target and these commands don't work this way.
If you're very careful you could save the queue to a file and then open it in notepad++ and update the target path using a regexp find/replace.
In fact this is how i worked around this Problem. My hope was just that i oversaw a potentially sciptable capability of the app. And so i decided to ask.
Anyway, thanks for your responses. By the way, this forum lacks a Thank-button.