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Gecko supports an enableInlineTableEditing command. Needs investigation. Suggested by Alfonso MartÃnez de Lizarrondo: http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2011-August/032941.html
At least one of the problems with that command is that it's a global toggle which affects all tables in an editable section. While all of the rest of the execCommand APIs are that way, I would like to avoid specifying another sucky API if possible... ;-)
But I must also add that this is definitely wanted for web developers, I think. Without this feature, there is no easy way to edit tables on the web...