Das wirkt nicht auf Mac, nicht im 1.6 und auch nicht im 1.7 Beta.
You can easily change units in 1.6 by using you get the information of the picture and a field to choose the units to like to work in
In AF Beta 1.7 you have a good working crop tool which gives you the option to set dimensions and dpi. It works exactly the same as in PS, but no option to create preset
Just waiting for a good preset option and the workflow will be as fast as PS. That's the only issue I really have with AP it takes really more time to handle a bunch of photo's because you have to resize each photo before you crop the image in the right dimension