Enhancement: Precise drag (ignore automatic snap)

I sometimes need to precisely resize widgets to get it just right. However it seems that Balsamiq tries to snap to a nearby edges. This is a great feature, however it can be a pain when you need resize with precise control. In Photoshop I can use a modifier keys to disable snapping which gives much finer control.

Note:
I realize also that I can select an item and use the cursor keys to move them precisely, however this does not work with resizing a UI widget.

Could we add a modifier key in Balsamiq that will disable the automatic grid alignment?