Origin values/ruler direction

OmniGraffle OmniGraffle for Mac
#1

I also use Omnigraffle for floor plans and wall construction.

I need the ruler values in increase upward, that is with the values at the top of the document to be larger in value than values at the bottom.
Ex:
now - need
-5 - 5
-4 - 4
-3 - 3
-2 - 2
-1 - 1
0 - 0
The same should apply to shale, the bottom left should be 0,0 with up-right values increasing.

#2

As far as I know, there is currently no way to change the axis. It took me a little getting used to (and still seems odd compared to everything we learned in school). Maybe OG staff will give us some background on reason, but I would guess it is because page measurements usually start in Upper Left and go from there (across and down).