It would be very helpful if there was something to indicate which items are wishlist items when one is quickstocking things. Sometimes, when I've been vending, I have way over the inventory limit and can't see all my items to take them out and put them where I want them, so it would be nice if there was a way to see what's what in quickstock so I can just uncheck those items or pop them right where I want them.
"Quick stock will show up to 250 items from your inventory at a time."
QS shows items in alphabetical order. Could you just change your inventory sorting to "By Name" (stacks on) so that you see the same 250 QS shows? Move your wishlist items, go QS your things, then repeat.
It's what I did yesterday to get around this issue. I think trying to have the QS page check wishlist status would be a bit too much in terms of loading time- wouldn't it have to pull data the same way the shop stock page does?