Somehow I missed the news that NJ had updated his CPS-1 emulator - again. In fact, I noticed that this morning when beta 2 was released. This version fixes some bugs introduced in with the beta 1 release. Translated from the readme:
beta 2 -Fixed a bug where the controls for length-wise games did not correctly reflect the rotation. -Added Service Coin and Service Switch to Key Configuration.
News and translation: DCEmu (download and forum thread)