Has anyone figured out a keyboard shortcut to globally strikethrough selected text in any OS X app? We have ⌘B to bold, ⌘I to italicise, ⌘U to underline, but we don't (as far as I can tell) have a shortcut to strikethrough selected text in any OS X rich editor. 

I added a keyboard shortcut into System Preferences, but that way doesn't work very consistently. I also tried using TextExpander, but it doesn't support rich text formatting.

Has anyone come up with a way to do this?
Hey I just came across this question because today I just started to use Stickies as a To-Do list for things I need to finish over the day and I also wanted to have that feature that you strikethrough items or text you are done with…

I think an easy workaround for this is that you have lets say 3 items, then you go to mark your first item with the strikethrough from the Fonts panel and then select that all the item and go to Font > Copy Style (Opt+Cmd+C) and then because it is copied in the Stickies app, after, anytime you use the shortcut Opt+Cmd+V (Paste Style) over a selected item it will paste the strikethrough style anytime later on the app, even if you have any other copied item in your clipboard.