[int_19h]

I'd love something like that. But I would want that to have tactice clicks, like mouse scrolling wheels, so that it can also be used for paging in book readers.

Which speaking of, there is a niche there for a product that I think is actually realistically doable at small scale. On Android, most book readers can be configured to flip pages with volume up/down, which is extremely convenient for one-handed reading. No such luck on iOS, though, where those buttons cannot be taken over by apps. It would be nice to have some kind of case for iPhones that incorporated dedicated page up/down buttons along those lines, just connecting to the actual phone via Bluetooth and presenting itself as a keyboard.

[notatoad]

Afaik TikTok and the Kindle app both respondto media back/next keys, which is how the TikTok Bluetooth remotes work.

[int_19h]

I would assume it'd also work with literal Page Up/Down keys, however that is exposed for keyboards when using Bluetooth. The important part is having that on the phone itself, placed such that when you hold it with one hand, the thumb is conveniently placed on the page down key, so that one only needs to push slightly to flip to the next page. That's what makes Android phones so convenient for reading over long periods of time compared to iPhones, where you have to lift the thumb and tap the screen for every page.