My reason for wanting it to pause is to conserve battery whenever I take the watch off for a while. If the trigger to try to read isn't fired or the power impact of trying without a body under the sensor is negligible when the watch isn't worn, I'm happy with the current behavior.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
My question is: Why should it pause? Without any human body under the sensor it will not give any HRM event and with it no HRM reading.