I'm sorry, I just don't buy this as a valid problem definition. If 80% of items are updated in Silent Mode, then your concern only applies to situations where hundreds of items are being updated at a time.
I'd say the definition of the problem is valid because it holds as long as more than one file needs to be disambiguated, no matter how many files there are altogether.
For most users, this is only encountered when initially building a database. It's not worth the development effort to add a feature that's merely a one-time convenience for most users. Especially if would be at odds with the normal, everyday use of the program.
It's not at odds with any use of the program.
If the problem originates in the fact nowhere near 80% of items are being updated in Silent Mode, then there must be something else wrong. Maybe the file scanner is not configured properly, or further refinements to that function are required. Maybe there should be a option to download the top x posters so you don't have to choose (instead, you could view the actual posters, select the one to display, and/or delete the ones you don't want). And then there's the situation I mentioned before—where the user can't resolve the ambiguity either. Deferring the action risks obscuring the issue from the user. For example, it there's no poster, there's no poster. I would rather know this immediately, so I have the option of finding one by other means while the update continues to run, or bookmark it for doing so later. These are things I may not be able to do while running a routine such as you describe. And even if I could, that would just make the whole process more problematic and confusing.
I'm not suggesting auto selection of posters or whatnot.
Can you elaborate on the conditions that result in you having an intolerable number of items requiring user interaction?
I described this in the first post.
If I am a new user and select all my 500 movies for update, I'd rather do the selections with as little as possible timegap inbetween each movie.
If I am an experienced user and I add, say, 10 movies, I'd prefer not to wait between, say, 2 disambiguations.