This is a minor item - has a work around as below.
While editing controls, when the green stay-open button is active, and on the midi page, if you move to a second control, the "No touch in play mode" and "Use vintage throttle" options vanish.
Work around - tap one of the other tabs, then return to the midi tab, and they reappear.
Using iPad mini on iOS 12.4.3. Have not tested on new iPad Pro with iPad OS, since I am waiting for all the necessary %^&*%% usb c cables to arrive to hook it into my rig.
Images
Now you don't see them
Now you do