I got this from hohle, but the formatting on Jon’s post is less-than-ideal.  So here it is, reposted for easy copy/paste:
Download his applescript here.
And here’s the plist:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Disabled</key>
<false/>
<key>Label</key>
<string>local.isync.sync</string>
[...]