Re: Jeff Hammond;
Thanks for the tip about the Ruby Rectangle tool! ...but still, it seems resonable that the SketchUp rectangle tool - and all other surface tools - should respond to a forced axis inference via the arrow keys...
Re: the Rotate tool "slick ways to control its orientation but it's not very well known" - it's only slick if you have existing geometry to infer to -- you can't enter two precise angles manualy to set the orientation. [to be fair, it is a helpful behavior but would be more useful if you could read and enter the two angles]
Of course, these current, basic behaviors (or lack of) really need to be documented because they are fundamental for new users being able to get their geometry into the desired positions with maximum efficiency and minimal frustration. (when they frustrated, they give up on the tool and tell all their friends about how bad they think is)
-- BrooksL