I believe I've figured a workaround, folks. On your iPhone, turn off Wi-Fi, Cellular Data (and make sure roaming is disabled!). Settings > Wi-Fi > Off and Settings > General > Cellular > Off if you don't know.
You'll be in offline mode, and your success or failure will not affect your rating.
Hi folks. I'm not entirely certain where to post this, as I did not see a category explicitly dated to the IOS app. My bug report / polite complaint is this: on the website, I have configured Tactics Trainer to the unrated setting. Why I can't I turn off ratings (and the timer) on the iPhone app? I'm a novice, and I'd rather stare at a position for five minutes and get it right the first time than iteratively miss a dozen similarly themed problems by a single move.
I do not believe I'm the only one experiencing this problem. Thank you kindly.