Okay. For those of you too dim to realize the solutions to a few of your problems instantly.
Everyone who's complaining about only being able to share the "Public" and "shared" folders - log in using an admin account and you can mount any drive in its entirety! Just mount the damn drive and be done with it! Access to every folder you want! No muss, no fuss! I mean, come on people, you'd have to have seen this available when it asks you what you want to mount...
People complaining about not being able to tab to buttons and the like: Open system preferences, go into Keyboard and Mouse, switch to the shortcuts tab, and click the "all controls" radio button at the bottom. There, it's done. Very easy.
Two-button mice are good things. If you have a user who's having serious problems, either tell them to never ever use the right button or glue it to an inactive position.
Menus already have hot keys, assignable from within the keyboard shortcuts section.
What OS X Could Learn From Windows