I see what you mean now. That option was written back when we were on XP and will need to be updated to work better with Aero. I'll add a TODO list item to look into this.
As for the feature to go over the task bar, we'll have to think about whether that should kick in automatically or whether we'd need to add an additional option for that. Since we're already using the None window style to get the custom chrome in non-Aero, there's no good way for you to indicate you'd want that feature right now. We have code in there that disables it right now. Otherwise, all instances of RibbonWindow that used the non-Aero chrome would cover the taskbar when maximized, which obviously wouldn't be good. :)
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