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J
Jim's "Add Layer" lets you do this: http://sketchucation.com/plugin/832-jf_add_layer
I embedded this in Layers Panel: http://sketchucation.com/plugin/751-layers_panel (Hold down the "add layer" button, it will pop up a menu)
K
Dave's tips for efficient model building are spot on. If you still find yourself chugging a bit too much, don't forget the document setup options for editing and output.
layout2013docsetup.JPG
