I wrote the script below to automatically switch to the target language (first in the Dropdown list, so it works great for bilingual projects) after preparing files newly added to an existing project.
After loading the script, you don't need to do anything else, the script will be triggered when you click OK in the Batch Processing window after completing your file preparation, switching to the target language.
Tip: I've noticed that the name of the control (WindowsForms10.COMBOBOX.app.0.29531c8_r9_ad14) is different between my desktop and laptop computers, so you may want to check yours and make the appropriate changes if the script doesn't work on your system.
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;Automatically switch to target language after preparing files
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#IfWinActive ahk_exe SDLTradosStudio.exe
~LButton::
IfWinExist, Batch Processing
{
WinWaitClose, Batch Processing
Sleep, 1000
Control, Choose, 2, WindowsForms10.COMBOBOX.app.0.29531c8_r9_ad14, ahk_class WindowsForms10.Window.8.app.0.29531c8_r9_ad1 ; Selects option 2
}
Return