Move augmentation dot

[Thomas Scharkowski]

Hello list,

I need to move an augmentation dot horizontally or vertically in a 
polyphonic situation to avoid collision with a notehead in another 
voice, but cannot find the appropriate command(s).
\dotsUp does not help.
Something like:

\override Dot #'positions = #'(0.5 . 0.5)

?

Thomas
cygwin
2.1.28