counterpart of "Bangle.on('accel',...)"?

@allObjects passing null for the function produces

Uncaught TypeError: Second argument to EventEmitter.on(..) must be a function or a String (containing code)

And I do not want to provide a dummy function, since removing an event handler may (now or later) be used for internal optimization (as no handler has to be called if none has been provided)

@Gordon great, thank you! Is there also a possibility to uninstall a specific handler only?