I hope the go-around button only works in approach mode as accidental engagement in cruise in the weather would be most unpleasant
For the GA mode to work you need to be already coupled, selection of GA cancels all other modes but after engagement any lateral mode may be used, if any pitch mode (VS, ALT, ILS, IAS) is then selected GA is cancelled. would work if the button were pressed in the cruise, but difficult to see, given the position of the buttons, how you could do this accidentally.
Nothing unpleasant if you were to hit it in the cruise, it just commands a 750 ft ROC and maintains the current heading.