@Chareng: The climate transition would vary depending whether it's a large or a small continent.

A... (something), hot steppe, hot desert, possibly some more desert, then steppe (usually the cold one depending on the latitude) , the Csa and so forth.

A clarification on Dsa and Dsb: If you want to make them more common, you would only have to lower the average temperature of the planet by a few degrees. Making so would lower the temperatures of Southern Europe during winter just enough so the average are below zero in winter. The the Csa would become Dsa or Dsb, I suppose unless the change of temperature brings other changes to precipitations.