I would guess if you ended up not taking the truck and needed to refund the deposit they would do it anyway otherwise like others have said their online reputation would tank. Using the non-refundable part as more of a deterrent.
I do see their perspective as a small town dealer and not...
Should be able to request it be removed or never added. Man, it seems like dealers keep increasing the price on this useless "feature" too. I feel like a couple years ago it was a couple hundred.
Personally I find the blinking brake lights annoying.