Modifier to Move Instead of Copy?

[schalliol]

In pr4, dragging a file over to one machine copies.  A nice feature would be the ability to hold down a modifier which would drop the original into the trash, which would make it sort of like a move.

[wa]

could we have the option to press command and drag to move rather than copy files? This is how Leopard works for finder drag/drop copies between volumes...