I found a quick & dirty way to get rid of the log-in prompt that appears when starting PSE12, which many people find annoying:

1. Rename %ProgramFiles(x86)%\Common Files\Adobe\OOBE\PDApp\core\PDapp.exe to PDapp.old (or something)
2. Copy notepad.exe to the path above and rename it to PDapp.exe

That's it. I don't know if this has any negative effect on the program, though... :)

Regards,
Pär

Same as for premiere... follow the vendor guide and forget what you used to know...

"%~dp0setup.exe" /UL1033 /V"SERIALNUMBER=XXXX-XXXX-XXXX-XXXX-XXXX-XXXX COUNTRY=242"
IF NOT ERRORLEVEL 0 Exit %ERRORLEVEL%

Reg key for the wizard at launch...
[HKEY_CURRENT_USER\Software\Adobe\Photoshop Elements\12.0\WelcomeScreen]
"QuickLaunchApp"=dword:00000002

wizard asks for organiser, wizard or Photoshop, the above key sets it to open the application in Photoshop. (thankfully we can use Appsesnse to do that)