How can I do pixel snap in Painter?

When I mport a decal and want it to shift say 10 pixels in V  or scale to be exactly  128x128 pixels ?

Or if I my current texture is 512x4096  and material I use is 2k x 2k    and I want it to be  tile 2 times in V direction and  be exactly a crop of 512 pixel  of the left edge ?     

I did such nodes with pixel processor in Designer  but once I export as sbsar they  never works properly  and my textures always gets extra blurry   even if I work in twice of my target resolution.    Because in Designer I have to use extra outside node to size calculations .

Did anyone ever try to make pixel accurate transform for Painter?