As per the guide on how to use the feature suggestion section, we encourage users to stick with 1 suggestion per thread to give other users a chance to vote for the individual suggestions instead the full stack of suggestions combined in one thread. This will usually also give you more or quicker responses from other users or mods (digesting a bunch of suggestions takes a little longer 
).
As for your suggestions…
I’m not sure what you’re suggesting… do you want Plex to display such a folder structure (independent of the actual folder organization/naming) or is this how you’d like the individual tracks inside a folder to be displayed?
Maybe you can explain your particular use case a bit more.
Plex will read genre tags from embedded metadata fine for supported file formats. Plex won’t read file properties (if that’s what you mean by „file tags“).
Keep in mind that Plex currently doesn’t support genres for different tracks (just for albums). There’s already an existing suggestion discussing an option for Plex to add support for per-track genres.
There’s already an existing suggestion discussing an option for Plex to recognize the BPM information from a file’s metadata (or by analyzing the audio). I suggest you comment/vote in that thread in order to help us avoid distracting or cannibalizing votes.
This however appears to be the first post / feature suggestion discussing the addition of Key metadata.
