The central market needs 2 features added.

"Buy all listed X price and under, + max preorder amount"

"Fill all orders X price and over, + max listing amount"

IF You can list 10,000 of something and there are 30,000 orders and you have 40,000 of an item in your CM, you should be able to list 40,000 at a time, filling all 30,000 orders and also listing 10,000 of that item.

The reverse should be true as well.

If you can preorder 1,000 of something and there are 200,000 of that item you should be able to put a buy orer of 201,000 on that item provided you have room in your central market to hold it all.

Example A, I have 50,000 nutmeg and there are pre-orders for 23,309 I should be able to click list max amount at 2,060 silver each, then the CM will take and fill all 23,309 orders and add another 10,000 nutmeg for sale at 2,060.

Example B, for whatever reason I want 4,000 Trace of Savagery, and I have enough room in my CM for all 4,000 traces, but there are only 2465 Trace of Savagery listed.  Since I can only pre order 100 Trace of savagery but there are 2465 I should be able to buy all available up to 4,000 traces or my CM is full or the Traces are sold out.  My Buy order would then be Buy 4,000 Traces allowing me to buy out all 2465, but the preorder limit is 100, so I would only buy out all traces and put a buy order for 100 traces putting that number at 2565.

Listing items that are in high demand or buying items that are in stock should not be tedius.

Overcomplicated.

They simply need to:

1, make max buy and sell amount the same size

2, Every item should be orderable at stack size equaling to 5000vt (except pearl items that should have the current limit)

But this was already suggested and ignored by PA already.