I assume you are talking about user tuning tables, the ones built in. I know I played around with some alternate tables and even tried making some with scala--software related to alternate tunings. I don't think I ever posted mine because they were not really finalized (i.e., complete with 128 tunings for midi notes 0 to 127). I am not sure anyone else posted them. Hmmmmm. I didn't see any posted.
I do remember a discussion or two. One user described using scale-linked tuning tables--tables in keys (F major, C minor, etc.) that worked well with arps so that arp patterns played notes only within the key signature. I remember giving that a go, but I don't think I set it up for the full 128 notes. I will have to look for that.
I seem to recall possibly using debug (an ms-dos) utility to edit the file rather than painstakingly dialing through the menus on the front panel. Not sure I ever tried editing tuning tables with Proteum or Prodatum, but those might be options.
I remember struggling with scala to get it to send the tables to my E-mu, but I seem to recall there were issues with the midi utility that was either recommended or bundled with it.
I now have OBS-Open Broadcast System and might be able to do some go through scala and record my monitor. If I can get that done, maybe I can edit into a tutorial. Are you interested in an particular type of alternate tuning?
Steve