Wotcher,
Since b7 moving a twistie up whilst "Move item up one line" and presunably down, in addition to moving the relevent selection, also adds the item below it and adds it to the selection making multiple moves unlikley to obtain the desired result.
In addition, changing the priority of files in this manner, doesn't appear to always have the desired outcome of having them change in download order, I have been suspicious of this since b2 (I did not try b1). I *think* they are sometimes ignored until I kick it either by move to top (when already at top) or Control-Y.
Regards,
Francis.