First of all, thank you very much for developing this plugin! I have a client who has over 600 YouTube videos, and this plugin literally saved me from hours of work.
I have two (related) feature suggestions:
1. Have the plugin auto-create sub-categories for each playlist, so that the videos are better organized.
For example, if the assigned category for the imported videos is called 'My videos', importing a YouTube playlist named 'holidays' will automatically create a sub-category in 'My videos' called 'holidays'.
2. When importing from separate accounts, give the user the option to assign a different category to videos from each account.
So for example videos imported from YouTube account 'A' go to the category 'Videos A' and videos imported from YouTube account 'B' go to the category 'Videos B' and so on.