I also find playing on a laptop without a mouse (using the touchpad) to be a pain. Quite often during combat you can click the mouse with a light touch & your char moves when all you wanted to do was scroll around & look at mobs/mouse over stuff. Would be good to have some sort of diff option...perhaps can make right-click move instead? Sorry if that's already in the options, eh.
If you can't stop yourself from tapping your touchpad's quick click I suggest you simply disable it. Accidentally doing it will be annoying with absolutely everything ever and not just this game.
It's ok & manageable with almost every other app/game in windows, just this one is so laggy...although I've now tweaked a number of graphics settings to make it perform a bit better, so the quick-click isn't so bad. Thanks for the suggestion & simple solution in any case (why didn't I think of that?

. Will give it a try if it gets to be too much of a pain again.