Hey @DaveMueller - welcome, and thanks! A couple responses:
For bluegrass, one thing that seems missing is the “uptown” rhythm style commonly associated with progressive bluegrass (omit 3rds, replace with fifths) and the percussive “thunk” that sets up the downbeat strums.
Could you please provide a recorded example or two of what you’re talking about? I may have this covered but I’m not sure.
It would also be great if there were standard rhythms for boogie/rockabilly/blues music at some point.
Yes! At the moment I’ve got two of these planned: a swinging strummy rhythm that alternates with a major sixth (e.g. Hank Williams in Long Gone Lonesome Blues) and a bass-heavy muffled blues shuffle (e.g. this random YouTube demo minus the fancy treble-string licks). I’ll repeat the title of this thread here: am I missing any? (I’m sure the answer is yes, so if any specific patterns/examples come to mind that you’d want to see, let me know!)