Morning Armaegis...
#1. Tooltips are enabled by default. Providing you haven't turned them off, when you hover the mouse over a track, you should get a tooltip that provides information about the track, including which playlists it currently belongs to...
You can also open the "Tag" action window in the lower left of the program and click on "Playlists" for a visual indication of which playlists
selected track(s) belong to. If you do not see the Playlists entry in the tag window, then right click anywhere inside the window and follow the "Also Show.." menu to find, and click on, Playlists.
When you then click on the Playlists entry in the tag window, you will see a tree representation of your playlists.
A tick indicates that all files belong to that playlist
A filled square indicates that some of the selected files belong to that playlist
An empty square indicates that no files belong to that playlist
You can click in the squares to add/remove files from playlists.
#2. ([artist]="Louis Armstrong" or [BPM]=<150)
#3. You cannot exclude the BPM field from analysis, but what you can do is copy all your current BPM data to another field for safe keeping, analyse your audio, then copy your original BPM data back to the BPM field...
Tools > Options > Library and Folders > User Library Fields > Add Field
Name the field anything you like, beepm, for example, and press the OK button as the defaults will be fine for this purpose.
Next, use the "Also Show" menu in the tag window to include your new field.
Make sure all audio files concerned are listed on the right, then click on beepm to edit it. Simply type in =[BPM] and press enter to have the bpm data copied over to your new field.
Do audio analysis, and when it's done, click on the BPM field to edit it, and type in =[beepm] to copy back your original BPM data.
If you're a tidy type of person, you could now go back into library and folders options and delete that beepm field as you should no longer need it.
-marko