Hey Antoine,
I don’t think anything has changed in that regard, all the patching and DLC logic has seen very little development in the recent years.
However, it seems that there are additional parameters to also set a root directory for these two options and they have been in the code for almost as long as the other options:
-basedonreleaseversionroot=… and -createreleaseversionroot=….
You could try setting these to a custom location and see if they work.
Given the age of that code and them only being used for saving the AssetRegistry they might not work at all, but it’s worth a try.
Kind Regards,
Sebastian