Receiving PO workflow

Hi I seem to use inventory in a different way to what was intended. Wondering if a few little additions could be made that would help us. Our purchase orders are sent to our factory then they raise the invoice at the time of loading the container. We have been using the same factories now for 15 years so our way of doing business may be different to other companies. So basically until the goods are in the shipping container we do not know how many items they are sending or the end cost of the item. This is what causes my problem.
1. I have to update the purchase orders will the new incoming amount reflected on my invoice. The amounts can be higher or lower. That part of editing is not an issue but when you edit the incoming QTY the receipted qty field does not update to the new incoming field. Is it possible to have this receipted qty field to update to match the incoming purchase order amount or have a button I can click that automatically updates that.
2. Also pricing. When I raise the purchase order I would love it to prefil that field with the last know price I purchase at. At the moment I need to change any product price on the purchase order but also go into the product card to change the default price so it can populate the purchase order field correct next time. This is such a big work around when importing hundreds of products at a time you cannot edit pricing in the one location. Our pricing changes 2-3 times a year due to fluctuation in costing in China.
3. Searching for products in stocktake, purchase order or stock adjustment. Can the search please be updated. at the moment it is like neto POS and very annoying as you have to have the full sku or correct title to search. You cannot put in partial words like in the rest of the cpanel to locate items. Once again this is another 2 step process as you need to locate the name or sku of products before raising any of hte above mentioned. What is the beneifit of solving this problem? Finding a solution for the 3 above items would take make sure each thing is a one step process. At the moment all three take 2 steps to complete which is time consuming and verging on not possible for me to continue to use the inventory as there are faster ways to achieve this