Within the Triathlon Workout type I have the Lap Key set to 'Off' (and I have the lap key set as a Hot Key set to HOLD to 'Lap') - I would expect the button to be ignored for single presses... this should stop any accidental presses.
However while testing out this workout, with a swim, bike and ride - I notice that I can move to 'Transition' by single pressing the lap button.
I know I can set a system option for 'auto lock on', but holding and then pressing isn't what I'm expecting.