Allow to "add to cart" directly from the stock management screen?
Sorry, I don't understand what you mean. The "add to cart" is a frontend functionality and Purchase Orders are managed from the backend only.
However, if you meant to create Purchase Orders by selecting products from ATUM's Stock Central, indeed, will be a feature that we plan to add to the add-on.
automatically get all the low stock items on the PO for a specific supplier (that we can edit after of course)
This won't be part of the initial release but it sounds interesting. We'll consider adding it on any future version 😉
Can you tease us a bit with what's coming? and when?
It should be available in the coming 3-4 months.