I really love the app and  the fact that it improved a lot since I started to use it about a year ago.
I don't know if you know the book "the coffee roasters companion". I learned a lot from this book and think the commandments he gives are really useful.
One commandment says that the ROR (rate of rise) should constantly sink during the roast. It would be helpful to switch on an automated ROR curve.
An other helpful thing would be to see the percentage of the onset of the first crack compared to the total roast time.
Vor example the first crack started after 75% of the total roast time.

I found this two options which look interesting to me.
1. a WiFi thermocouple from Corintech (available)
http://www.corintech.com/news-about-electronics.php?electronics=Corintech-launch-new-thermocouple-WiFi-data-logging-sensor
2. a grill/cook thermometer to plug into your earphone jack. (pre order)
https://scooter.supermechanical.com/