The ridge on rakes has become very popular and is specific to composition shingles.

 The benefits:
  Looks.
  Felt is folded over the barge rafter and tends to be more watertight.
  Rake metal is un-needed.

 The drawbacks:
  Cost of additional ridge.
  Cost of additional labor.

 If the Ridge on Rakes checkbox is checked your rake feet will be added to your ridge
  feet.

    Roll starter on rakes
 If the Roll Starter on Rakes is checked your rake feet will be added to your eave feet.

   Example Ridge on Rakes:
  You have 32ft of ridge and 32ft of Rake and have 32 entered as your divisor. This
   would produce
  2 bundles of ridge, 1 for ridge and 1 for rake.

  If you have entered numbers into the bu of ridge or starter per sq, the amounts will be  added to your total squares.