I'm surprised at the negativity, Oh Great Ambassador!
There's a seller on Bricklink that sells official elements in colors that do not officially exist - I have several examples of such. I can imagine several methods of acquiring such elements in quantity, even methods not fully above board. The same way that someone might acquire flame elements, but with slightly more purpose behind the procedure.
Given that such things obviously occur, why can't Lego make the special effort for us?
They obviously have the molds. The molds are used for sets currently or very recently in production. All they have to do is mix the colors and make a few runs for us - they could start small and see how they sell.
I realize you cannot promise anything. But this one seems like a perfectly reasonable request. Autumn colored foliage would really make those MOCs at Lego fan conventions pop. It would create enormous good will among adult fans of the product and be great free publicity at shows.
Everybody wins.
They really should be doing things like this. The same way they do PAB. Bulk foliage in multi-colors. However they want to do it...

