It has been a long time burden when managing vendors. There are plenty of instances when going beyond 1000 item stacks on orders just as it does with sales. I saw in QA one of my COTO order stacks was properly converted from 100 to 10,000, but I am unable to create a new order for 10,000 COTO's and I assume anything. I'd love for this to finally change! Moving beyond the 32k stacks entirely would be even better, as well, but 32k is far more flexible than 1k.