Voice notes
Sometimes when I hear something interesting in podcast I'm writing it down to check it later. It is not possible while running or other activities. You might add something like recorder enabled through headphones remote controll which will stop playing podcast and enable recording to leave short note. After that places where user left note might be also marked on podcast timeline.
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Raphael commented
Me and my son mostly listen to podcasts on the drive. Many times, mostly on tech oriented podcasts, you want to put some bookmark to further research or reflect on an issue when both of your hands are free. Voice commands in general and voice bookmark specifically would be vey useful and appreciated. Should be fully automatic.