Also want to second this request! Our store has both an in-store POS as well as an online store, with shared inventory. We update Sale prices online utilizing the "Compare at" price variant so that online shoppers know that the item they're buying is discounted. At the register, there is no way for our staff (or customers) to know that they've received any discount whatsoever. The only way our staff can check that the discount is correct is by logging in to the admin portion of the site and checking that particular product, which isn't really possible when trying to make a quick sale.
More customization of receipts as well as the POS Cart Screen would be incredibly useful.
The Compare at price or MSRP and Price should have the option to print on the receipt in the settings of the POS. This is a standard feature with POS systems since the 70's
Shopity does great with online, but many basic features like displaying both prices on printed tags, receipts Shopifty POS lacks.
Shopifys' model of having app's to make up where they lack is not a good model for mom and pop store owners.
We do not have the time to search for apps to make Shopify POS work like a standard POS, very disappointed in the their POS. It has potential but is so far behind the norm of what is expected in a POS.