The VideoLAN Forums

Now that VLSub must be configured, can it at least be portable?

Currently, configuring any setting in VLSub creates %APPDATA%\vlc\lua\extensions\userdata\vlsub\vlsub_conf.xml

Is there any VLC command-line just like --config=<string> to make it a use a local portable file?

It should be portable if you set VLC to be a portable application:
https://forum.videolan.org/viewtopic.php?f=14&t=160467

Thanks! I've made a ticket then to officially document it.

And also a ticket about vlsub_conf.xml storing an opensubtitles.org password in plaintext.