Tabbing to all controls in Mac OS X

I'll bet you're all getting sick of all these computer posts, eh? Frankly, so am I. :) Whenever I try to browse the web on a Mac (usually in FireFox, but sometimes in SafarI), I go crazy because I use the keyboard a lot. When a login form presents itself, I type in my username, Tab, password, Tab+space to check the "remember me" checkbox. I also like to tab to buttons. By default, the Mac only tabs to inputs and textareas, but you can change it in System Preferences -> Keyboard & Mouse -> Keyboard Shortcuts:

Keyboard Mouse Prefs
If you don't see what you're supposed to change, it's the "All Controls" radio button at the bottom of the dialog box.