Happy late birthday eric, I'm glad that the new face extrude with built in booleans will be useful!

Here are the notes on that particular part:

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Extrude auto booleans for faces. Make a face sub-object selection automatically boolean the extruded result with the base object. Allows for "push/pull" type action with Extrude command. When extruding a face of a solid, going outwards from the solid makes a boolean union of the result, going inwards does a boolean
difference. With an open surface, the extrusion is merged with the surface and the original face is removed to make a pocket in the surface. The auto boolean behavior can be disabled by setting the "Keep separate" checkbox in the extrude command options.


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I think it should cover some stuff that you've asked for previously and also the type of stuff Andrei was asking about here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=6693.1

- Michael