I've been running INK 9.2 for a couple of months and haven't noticed anything, except that it's better. It still has some bugs though - the biggest one is you can't have more than 1 window with it's XML editor open at once or it gets mixed up.
I put 1" into the grid and switched it to px, and it says 96px.
I guess someone has to make a part with pins 0.500" apart and check the Gerber.
EDIT
Looking at the drill.txt, with 8 holes at 1" spacing in the svg, and it's 1" in the drill too. Looks like it only matters if you use px dimension to draw.