Thanks for the feature request. The ability to add rows above the columns on custom pages is not currently on our roadmap, but we've heard a number of customers ask for it and will consider it if we get enough requests. We'll keep you posted.
Thanks for your patience. Our new Custom Page editor went live this week and includes the ability to split columns. Details here.
Multi column interface is very useful, but at the top it would be great if we could span all the columns for the purposes of alerts, banners and other solid layout items.
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