This is so important for the holidays, it's a very standard feature, no 3rdparty apps do it right and everyone is telling Shopify we don't want to do workarounds with collections, we just want the ability to discount properly in POS especially since you're charging $90 a month per location.
Thanks for your feedback. I just want to let you know that we have forwarded all of your feedback to our developers to work on improving this. I'm unable to provide a timeline as all things in development depend on a number of factors, but it is something we are aware of and are working on.
If you have any examples that you would like to share if what you would like to see, please post them here and I can absolutely send these up to our team so that they are aware. Our Shopify POS was designed to accommodate new features as we continue to develop it and incorporate important feedback like this, we're unable to provide any guarantees on which features will be included. You can view a list of the current features, here: Choosing your POS App Subscription.
As a workaround, you can use a third-party app from the Shopify App Store like, Ultimate Special Offers by Pixel Union, which works with the POS. You can also create discount codes and train your staff to manually add the discounts during each sale.