Quote - Yeah :) Waiting for the next part - since so far, it wouldn't work for me. My prop moves always with the origin center, whatever I do

Your best bet is to load the prop itself into a scene with nothing else in it, then use the joint editor to set the rotation point to where you'd like it to go.  If your still having a problem with the staff moving each time you try to change the rotational center in the joint editor, try exporting the prop, I generally just export to an OBJ file myself.  Then delete the old staff prop and reimport the OBJ file back into the scene, with the "Make Polygon Normal's Consistent" option checked, if you uncheck all the other options it will reimport the staff right back into the exact same place you exported it from.

Now you can try changing it's rotational center.  I've found this will usually do the trick quite nicely.

Another trick I've found works well, to position a staff, gun, or some other object into a characters hand, sometimes it's easier to move the hand to the object than it is to move the object into the correct position for the hand.  

I generally get the object fairly close, then bring the hand to the object and get everything all lined up there.  I will then save a pose for the hand (just the hand mind you, not the forearm etc) so that the hand will pose properly to the prop, and save the prop as a smart prop. 

That way when I load the prop into a scene I can load the prop and it will auto parent to the figure I need, then I can just click on the hand pose for that figure and with just two clicks I've got exactly what I need, saves a lot of time later.