Hi,
yes, I was confronted to this problem, but can't remember what I did exactly, but the following solution will work:
attach your cube to a dummy, that is positioned at the center of rotation, then animate that dummy, then detach from the cube from this dummy. Repeat that process when ever you want to rotate "around"
I will search my projects where I had this issue where I wanted to iTween rotate around, and get back to you, I just can't remember which project it was...
bye,
Jean