>>Couldn't you use st and /st (with brackets around them) or some other wrapper characters to indicate strikethrough? It's not standard HTML but neither is <g>.
>
>The support a specific acronyms is in regards to offer the ability to members to obtain this behavior. I wouldn't want to create an additional convention to support a HTML tag.

Your decision, of course. It just seemed like it would be a fairly easy thing to do. Then again, it's always easy when someone else has to do it <g>.