Additional options for advanced mouse button and keyboard controls.

Some actions that it would be nice to see in your list of advanced settings, if not too difficult :p.

TaskbarItems

1. Pin-on-Top // toggle always on top
   
2. Send-to-Bottom // place at bottom of z-order
3. Open Properties // it's my most missed item from the jump list menu
   

EmptySpace

1. Reveal (Peek at) Desktop // like hovering over the 'show desktop' button, but by holding a button|hotkey
   
2. Toggle 'Locking the Taskbar' // i keep rclick set to taskbar inspector, so it would be nice to get at this setting
   
3. Swap Windows // switch focus to the previously active window

Window swapping could also be useful on taskbar items; I'd rather switch to a previous window (if available) than minimize/restore, when clicking an active windows task button.  This would be confusing to most users though, that's why things like this are best left hidden in registry tweaks as you have done, +1.