Hi I am having trouble with my drop shadow increments. In a document that is 20 cm square, I have to set the drop shadow to 0.07, 0.07 and a blur of 0.08 and in a document 90 x 55 cm, the drop shadow is .2, .2 and blur .3. I thought it might be in my preferences General is cm, Stroke and Type .. Points. Using CS6.
Are you talking about units of measurements? Can you paste a screen shot of each so we can see what the problem is? Sounds like the amount of offset should work, but can't tell without seeing it. I use inches myself. Not sure what the problem is. Please be more specific.
It is just another vector shape behind with an effect like blur or feather. If you find it easier, you can use a copy of the shapes making up the object casting the shadow, unite them using the pathfinder, and use the scale and shear tool to stretch the the shape to look like a shadow. You can make a shadow effect and expand the object to manipulate the shadow image separately but it will be a raster image.
In case you ned a visual to guide you hee is a simple video