I got an email from someone who had commented on my blog and who had…
Select/Deselect All in Edit Entry pages

Not so much a mod and not at all that I wrote it.
I found this check/uncheck all script at http://javascript.internet.com and have used it on other forms. We got hit with a ton of spam (before upgrading to newer version) and I wanted a quick way to select all comment entries to delete them all. Hope this helps someone else out too.
gm-library.cgi:
BEFORE Line 8944 INSERT:
<script type=”text/javascript”>
<!–
/* This script and many more are available free online at
The JavaScript Source!! http://javascript.internet.com
Created by: Hillel Aftel :: equazcion (at) gmail.com */
function checkAll(checkname, exby) {
for (i = 0; i < checkname.length; i++)
checkname[i].checked = exby.checked? true:false
}
// –>
</script>
BEFORE Line 9073 INSERT:
println(‘<input type=”checkbox” name=”all” onClick=”checkAll(document.editentry.multideletecommentselection,this)”>Check/Uncheck All<br>’);