Creating a batch setup with custom audio settings

[Selur]

I've already set up my default save paths, but it seems that when I import a video, I need to go to the Audio tab and click the + (Add current), otherwise the audio does not get encoded in the video (note that in the Base tab, I've set audio processing to "custom.")

Yes, if you set 'custom' you need to do everything by hand.
You probably want to use another audio processing option,.. (read the tool-tip)

How can I batch process a bunch of video files in a specific folder, using the same settings for each video file?
...
Do I need to manually import each file and then click the + button, or is there a way to do this automatically for each video file in the folder?

Configure Hybrid, to automatically apply your settings to a source you load, then drag&drop all your files/folders into Hybrid.

Cu Selur