9 hours ago, cheong wrote
Emmm... What I said was that the button is disabled until either of the sound volume key is pressed. It won't prevent you from quitting frozen Apps.
I didn't read exactly what you were proposing for the lock/unlock mechanism. Bundling additional functionality in the volume feature like that will be too confusing for users - I see only 10-15% of people getting this right. It's a medium - hard difficulty task with a high cost if you can't do it.
I'd rather wkempf's suggestion of opt-in so you could at least avoid something that can screw up the experience. A difficult task that happens 2-5% of the time is much better than one happening in regular use.
27 minutes ago, wkempf wrote
This would require the user to accept the change, so that they are aware that the buttons won't function normally at this point.
The burden is also placed on them having to remember that they locked the buttons. Then, it would be up to the OS/app to flash a "buttons are locked, do x to unlock them" notification when you go to use the button, which brings you back to interrupting the game because you hit the buttons.
I think it would better if the handsets had a lock/unlock button (like the trackpad locks on some laptop keyboards) and a tiny light to indicate locked buttons. That way, you have some annoying light to notify you of locked status, and you also have some comfort knowing you're in control (because the feature is being exposed at the hardware level).