I'm with the developers on this.
I can see why you're asking it, but the code impact is that every
single
date entry field will have to carry a conditional with matching config
file entry, which is a lot of extra work and quite a potential for a
typo to sneak in - for a target audience yet to be defined..
One question, though. I know it's not quite as handy, but won't
cut-n-paste help you?
Alternatively, get a keyboard macro installed such as AutoHotkey
(http://www.autohotkey.com/), although I'm personally very wary of
keyboard things sitting between me and where money or privacy lives (I
don't use a wireless keyboard for the same reason :-). Remap a
function
key and away you go..