For part 1 about the Z Menu, check out THESE POSTS for some relevant ideas (as well as a reply from Dasius himself).
For part 2, there's an update planned on the Trello page HERE where you can see that improving the customer interactions is on the to do list.
Part 3 is an interesting idea. It would be great if you could store (and name) a few different recurring orders so that you don't have too keep cycling through all the different menus on the order sheet.
Happy Smithing!