The design of the large flat horizontal surface lever action type switch/s which by way of shape/looks has 3 small protrusions to make for a positive tactile feeling (& built like that for strength) are so made as to be placed in whatever position is required without the chance or at least reducing the chance of the fingers slipping off as might be expetced with a normal toggle type switch. These switches can be moved over a fairly large arc of travel across a detent (center possy) as opposed to a simple on/off switch. As apposed to the T.O/Taxi switch which is also a 3 possy switch which is normally only moved one segment at a time, this is a std type of toggle switch. Remember these two switches are normally turned off or on simultaneously and their very shape by design almost makes then act in the same manor when switched together as though a 'ganged' type switch
Also note that pretty much all other reg used 3 possy switches (ext & Int) have also flat or larger surface area lever action toggles as they can be moved thru two possies in one action:-)
Who dreams all this sh1t up?
Anyone???:-)
Anyway just a theory
Wmk2 way out on a limb here but my mum reckons it sounds good