It would be cool to have a multi pitch climbing app.
It should be a combination of the 'Indoor Climb' and 'Backcountry Ski' app. That means you should be able to lap different phases ('Approach', 'Climb', 'Belay', 'Rappel')
For each climb pitch you should be able to select the grade / difficulty.
All data should be summarized in Garmin Connect.