I think I remember + and - moving a surface along the direction of its facing normal... So a convoluted way to extrude by a certain distance might be to select the original surface, get its position (> button in left-hand pane), extrude once, select extruded surface, use 'moveto' to put it right on top of the original surface, then use +/- to move the surface along its normal by fixed increments.
Like I said... convoluted. Would be nicer to have a way to do it directly and with a precise distance. There may be one, but I do not know it. I've never missed it, though...
-- Jeff
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