I often find myself wrapping the same boiler plate around [[ikiwiki/directives/img]] img directives, so I tried to encapsulate it using the following [[ikiwiki/directives/template]]:
[\[!img size="" alt="" alt="" alt="[pic]" ]]

The result, even with htmlscrubber disabled, is mangled, something like
?size
Any suggestions gladly received. -- [[Jon]]