I've posted a
web page on our site with links that will toggle these intervals between their minimum and maximum settings. I'd recommend adding that to your Safari bookmarks so you can access it easily on your devices.
Between the Mac and iPad apps, it looks like three customers have requested a control that does this. We recognize that folks who want this feature feel strongly about it, but we try to avoid adding controls that the vast majority of customers won't want or need. Doing so complicates the UI of the app and makes it more confusing for them.
That said, if other folks out there do want this feature, please email the
support ninjas and let us know you need it. We can certainly add folks to the existing feature requests and consider this again in the future if things change.
Hope this helps!