Wow, this is cool. I put the following in my Free Nodelet:

<form method="post" action="?" enctype="application/x-www-form-urlenco
+ded">
<input type="hidden" name="node_id" value="`author_id`">
<input type="hidden" name="op" value="message">
<input type="hidden" name="replyto" value="user">
<input type="hidden" name="sendto" value="`author_name`">
<label for="replytotext">/msg [`author_name`|author]</label>
<input type="text" name="replytotext" size=30 maxlength=255 value="ple
+ase retitle &#91;id://`id`] to '' or similar, see &#91;id://17558]">
<input type="hidden" name="sexisgood" value="submit">
</form>

<form method="post" action="?" enctype="application/x-www-form-urlenco
+ded">
<input type="hidden" name="node_id" value="`author_id`">
<input type="hidden" name="op" value="message">
<input type="hidden" name="replyto" value="user">
<input type="hidden" name="sendto" value="`author_name`">
<label for="replytotext">/msg [`author_name`|author]</label>
<input type="text" name="replytotext" size=30 maxlength=255 value="ple
+ase add code tags in &#91;id://`id`], see &#91;id://17558]">
<input type="hidden" name="sexisgood" value="submit">
</form>
[download]

But the suggestion still stands: it would be helpful to have such a templating feature, so that it is available to all "off the shelf". Anyway... thanks!