Beta viewport manipulation issue (automatic pan shift?)

 From:  Micha
2526.1 
Hi,

today I found, than using the the "pan" function or the right mouse button cause an automatic shift of the viewport. For me it's very confusing to see the viewport automatic running. It could be nice, if the pan function could be like at Rhino, that the viewport follow the mouse without automatic shift. This "classical" behavoir helps to keep a feeling, where the viewport position is. I wished my english would be better to explain it. ;)

Regards,
Micha