Rockbox

I have heard several people mention how good a feature like this would be, but as of searching, I haven't found anyone submit a feature-request yet. Anyway, here goes...

Good IEMs or isolating-headphones are excellent, apart from they completely cut you off from the outside world. If someone wants to say something to you, your only real option is to take out/off your earphones/headphones, however with things like IEMs (especially with triple-flange sleves) they can be a hassle and waste quite a bit of time afterwards to put them back in. So, why not (for targets with built-in microphones) enable a button on the WPS to be optionally used for push-to-hear; when the button is held down, the music is paused and the input from the microphone is monitored through the headphones (allowing the user to hear the outside world). I'm not sure how much it would take to implement something like this, but it doesn't seem to me like it would need any major new code; in the recording screen sound is monitored through the headphones, etc.

Perhaps if someone wanted a little project, this would produce something practical (that I'm sure many would use) at the end...