No-edit. Addition:
</a> - Ends a link, text typed after this is normal text unless another <a:ExternalURL> is there.
EDIT: apparantly modify works now
<shadow:x:y> - Gives the text a shadow offsetted by x and y.
<shadowcolor:rrggbb(aa)> - Sets the color of the text shadow.
<linkcolor:rrggbb(aa)> - Sets the color of a link.
EDIT2: apparantly modify works now because badspot moved it to General Discussion exactly 1 minute after i posted it. wow.