doEnterHold is a function I created, essentially for my own purposes, but it could be overridden by new hacks. I use it in the Battery Icon hack to allow me to check the value of the battery when I want to, instead of looking at it the whole time the Reader's on.
Pausing and restarting music is more difficult than changing songs. main.xml doesn't include everything the reader can do, so sometimes we get lucky and there are functions we can use, but sometimes we have to roll our own. It's on my list to investigate, but I'm not sure if it's possible.
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