Shoot JPG and use an appropriate style? Or do you want to add watermarks or similar?
Perhaps. Depends on your skill. It is possible to trigger an action or script when Photoshop starts. In an input folder is not empty a script could run the Image Processor Pro plugin script to process image in the input folder then when the plug-in script finishes the script would move the files in the input folder to the processed folder and then close down Photoshop. If the input folder was empty when Photoshop was started the script would just exit and leave Photoshop started.
From Photoshop scripting guide
Using Notifier objects
You use the Notifier object to tie an event to a script. For example, if you would like Photoshop to
automatically create a new document when you open the application, you could tie a script that creates a
Document object to an Open Application event.
NOTE: This type of script corresponds to selecting Start Application in the Script Events Manager
(File > Scripts > Script Events Manager) in the Photoshop application. Please refer to Photoshop Help for
information on using the Script Events Manager.
The make (Add/add) command requires you to specify an event ID to identify the event to set up
Reference, Adobe Photoshop CS6 Visual Basic Scripting Reference, and Adobe Photoshop CS6 AppleScript
Scripting Reference. Some events also operate on several types of objects, and the make (Add/add)
command requires an additional argument for a class ID, which identifies the object. For example, the
“New” command is used for Document, Art Layer, and Channel objects.