I think he means putting straight elements (like hills) at say 45-degrees to the editor grid and still managing keep it straight.
If that's the case, try making one long segment for your element at the angle you want, select it and use the 'i' straighten tool. Select the segment again and click 'split up', then (making sure the snap is on, and set to a good value) select the new vertex and move it up to the right height. Voila', instant airtime hill (using an airtime hill for an example, lol).
I hope that's what you need, and that it makes sense. :p