>>My signature currently contains the html strikethrough codes. When I change the signature, they are refused. Can you add them to the list of supported html codes?! I'd appreciate that.
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>The S tag is already recognized on the Universal Thread as a conversion for the acronym smiley sign. Thus, it cannot support both modes. There are too many messages where member have adopted that in order to have the parser to recognize it as a smiley sign. So, we cannot change this behavior at this point.

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>.