I know there's a hidden default that controls this on the Mac, but I can't remember the specific name, or if it's one of the settings that are accessible through via a tappable link.
At the very least, the iPad app will respect the setting once it's synced over from the Mac, though.
If you email our
support ninjas we can track this info down for you - we read the forums as we're able, but threads do occasionally fall through the cracks.