Hello, could you please enable buying multiple seeds at the NPC's that sells seeds. It' get's tedious to hit the buy button hundreds if not thousands of times to buy seeds from the vendor. It kind of makes you upset when you see the buy multiple selection darkened so you can't choose to buy multiple. Thank you!!!

Yes, please!

And make them stackable while you're at it?  Seeds don't have durability, so there's no reason why they shouldn't stack.

I expect that the issue is a general problem with items that aren't stackable. AFAIK, you can't ever buy multiple non-stackable items at once. You can't even grab multiple non-stackable items from your mail at the same time. You're forced to take them one by one. It would of course be great if they removed that limitation in general, but it's probably yet another case of the game having a weird limitation that seems annoying and pointless but which is almost certainly caused by some quirk of how they implemented some aspect of the game (like how you always have to have two open inventory slots to do a lot of stuff that doesn't actually involve putting anything in your inventory - presumably because they actually have it interacting with some sort of object that gets temporarily placed in your inventory underneath the hood but which never shows up there that the player can actually see).

Of course, it's also pretty stupid that seeds aren't stackable in the first place, since they have neither durability nor an expiration date on them. Making them stackable would likely fix the problem with not being able to buy multiple at once.

This is more in line with PA not implementing changes retroactively to content that may be affected- You can now withdraw unstackable items in stacks of 20 from central market, so we have an example of that limitation being broken but of course they haven't or wouldn't change other forms of unstackables transferring. 

This is similar to how we have a vastly superior item search function in central market and inventory, but we have an outdated and bad item search in storage.

I agree with that seeds should be stackable, but also they need to change it so you can buy items that don't stack in mass.