2011 Wrangler - 91 Tune Features?

[ROBSMST]

Running the 91 tune, wondering what features are available to me. As far as I can tell I cannot adjust the tire air pressure sensors. No gears (but it was not necessary, speedo worked just with tire size).

Also, what does the crawl tune do? None of these are really explained in the quick start guide or manual.

Thanks!