See:
http://forums.adobe.com/thread/1338493
For Organizer users:
Do you miss the possibility to open jpegs directly in ACR from the Organizer ?
That feature was offered by John R Ellis in his OpenInAcr.
http://johnrellis.com/editinacr/
I miss the power and ease of use of ACR,
I miss the ability to edit pictures while retaining the 'last conversion' settings for shots in similar conditions.
I also miss the ability to open several jpegs at the same time in ACR from the organiser (The PSE12 editor enables opening several jpegs in ACR at the same time).
My suggestion is to let the DNGconverter work as the standard ACR version and enable it to convert jpegs and tiffs as well as raw files.
If you are interested, you can add your vote:
http://feedback.photoshop.com/photoshop_family/topics/dng_converter_what_are_the_command_l ine_switches_for_wrapping_jpegs_in_dng
