A big drawback using LR for event photography is that there is no quick way to print the currently selected photo using the selected defaults. It needs to be a single button press. At the moment, you have to go to the print module (where the photo may be shown rotated), and then press Print again. It's slow and clunky when customers are watching, and very irritating by the time you've done it a hundred times in an evening!
P.S. Surely it must be much easier to do this than most of the new features you add.