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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.
@Gordon
When Espruino is running on ESP32, it should set the baud rate to 115200 regardless of the board it runs on - if it isn't something is going extremely wrong indeed.
Rather than trying to add a non-standard baud rate to the IDE, I think it'd be better to figure out why this board isn't working correctly and fix that (since presumably it means that setting the Serial port's baud rate to any value will be broken).
If anyone else has this issue you can actually just type
http://www.espruino.com/webide?settings={"BAUD_RATE":74880}into your browser's address bar and it should make the IDE display a prompt asking you if you want to change the rate. It won't show up in settings, but it should have the desired effect.