Is there an option in the forum software to enable a strike-through formatting option? If so, is there a reason it isn't currently enabled?
I made a mistake in another thread that @trendy caught (good work!) -- it's times like these that I'd like to be able to edit my post with a strike-through so that it is still there, but extremely obvious that it is not the right solution (rather than deleting the post or text, sometimes it can be informative to have the non-solutions there, too).
AFAIK there is not built-in option to simply activate a strikethrough button.
Some plugin seems to exist that provides this functionality (together with a bunch of other options).