Is there no way to undo the deletion of a playlist? Also, is there any way to change what the delete key does?
There is no undo yet, that is an idea that is in the works.
You can click the “Reset hidden popups” button in the settings at the bottom so the confirmation popup appears again when deleting a track or playlist
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Any updates on this one? It’s a must-have - I just deleted a folder of playlists after working for a few days on them. Cloud backup is 2 days old 
Lexicon has Undo History now (in the Edit menu at the top). It doesn’t protect against deleting files from your disk though! But you can undo accidental playlist or track deletes