i think with OSCulator it's possible to change this, but this won't work on Windows.
It would be nice to have the feature in the OSC Preferences.
the point is i'm "screwing" on a lemur interface which controls 2 (or even more) Computers at once. (and the future will bring a Interface to sync 2 or more pc's). I control Computer1 with OSC0 and Computer2 with OSC1... so the Lemur can send it to 2 different ip's!
The only Problem now is if PC2 returns osc data, it returns the value to the interface from PC1.
if it helps, here is my interface... still in progress/testing so beware of some bugs

here is the actual version:
download/file.php?id=1530