No bro they can't do that probably why you haven't seen any change after they made the any changes.
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Unless you plan to take advantage of more options then the tire size I don't see it being worth it. Your getting the MPG's just do the math. Mine says 13 MPG but I know I'm getting 14MPG. it has some cool features though don't get me wrong. It adjusts trans point power fuel saver it's pretty cool from what I've read but expensive. I know exactly how far my speedo is off so I'll just deal with it and wait for a used one to come up for sale.
I was eBay looking tonight and no cheap ones on there. Check craigslist and some other jeep forums I would think. Not sure if one programmer can work with any vehicle or if there manufacture or model specific.