Checking missing tracks on specific albums (and other questions about the missing plugin and completing albums)

[Gamigre]

Hi, I'm currently in the process of cleaning up my library and using beet for the first time. In a lot of cases, I have incomplete albums, either missing a few tracks, bonus, skits, etc, or missisng all tracks but the one I liked at the time i added it. Anyway, I want to complete those incomplete albums and have exported a .csv file with all the tracks missing from all the albums I currently had ID'd with beets missing
(command was simply "beet missing > missing_tracks.csv"
I am now completing manually each album, one by one.

Now, I have a bunch of questions:
• It seems that accordingly to what I have seen online, the only way to properly add a track to an already indexed album is to remove it completely with

beet rm -a "album_name"

and then importing it fully again after adding the missing track(s) to the folder. Is it still the best way to do it?

• Now usually I check the missing tracks before and after the removing/importing process with the following command

beet missing "album_name"

1. Is there a way for the plugin to tell me the album is either complete or not found? Currently, the answer to those two situation is a non answer, and beet terminate itself (it doesnt quit but i can type a new query) wether i'm checking on a freshly imported complete album that was missing a track or asking for missing tracks on "slkgfqùj,fg". A way to see if the album is actually complete and indexed would be nice.

2. It seems that beet has some issue finding specific albums that are in my collection. When I try removing the EP from Armand van Helden "You Don't Know Me" or jay-z's The Blueprint 3 for example, I get the following: error: No matching albums found, despite having them in my library and being able to check the spelling/copy and paste the names i'd get with

beet ls blueprint

3. Finally, during my first import, I had a bunch of tracks going into a folder called "Non-Album" which i don't remember being asked about in the config. Some of those tracks are proper album tracks, some of those are remixes, official or unofficial, some are singles. I'd like those tracks to go in their artists' directories with a folder for each of them, accordingly to their 'album' tag or, if missing, their 'title' tag. Is this doable ?

TLDR; my questions are:
• is removing and reimporting the best way to complete an already impoted incomplete album?
• Is there a way for the missing plugin to tell me when the album is complete versus simply stopping?
• How can i be more precise in my requests to help beet finding what i'm asking for, like specifying the album's artist or allowing beets to be a bit loose with the spelling of the query
• How do i deal with properly ID'd tracks that are not on an album?

thanks!