For some time I thought game could benefit from a floating button in Android, alike Messenger, that would mimic the in-game capture button, ie. display the timer and allow to punch capture regardless to the app you're in.
Since this would likely need additional programming, and I bet the game could use some additional cash flow that is not aggressive in terms of monetization, I think it could pretty well work as an UBT subscription incentive, ie. that the feature would be available only to players that have any active subscription, nano included.
Just leaving the thought here.