To my knowledge, nothing in Sales Insight can be customized in this fashion. What you see is what you get. This is a common request though, and one of the most popular ideas on the community is to improve some of the customization, reporting, and functionality of MSI. I'd recommend submitting this as a new idea, or tagged on to the existing idea here: https://community.marketo.com/MarketoIdeaDetail?id=08750000000HBDAAA4
Hope this helps!