We use custom columns to break down data into monthly columns using smart lists. Today, there is a cap of 10 custom columns, which makes it not possible to create a year long report broken down my month. I suggest increasing the limit to 12 to accommodate that (seemingly common) use case.
I would also suggest that the end user could rename the custom columns. Using the unique naming of Database Smart Lists can allow you to be creative and kind of show the title you'd like, but if you use a Marketing Activities Smart List as a Custom Column, it displays the entire program file path down to the smart list. Editing the name of a column would be a welcome improvement in making Marketo reports even more usable.
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