Not without some work. Aside from adjusting the number of results (1/5/10/etc) and specifying date/time ranges, unfortunately the Summary Reports page layout cannot be customized at this time the way you described, to be able to drag around or re-size different portions of it. But keep the wishes and use cases coming and feed these back through your Meraki or Partner reps to get back to the Dashboard team.
One other quick thought might be to tag certain devices and then you can narrow the summary report more specifically by those tagged devices, but that's still not going to allow the page output to be rearranged in specific ways.
One possibility may be to leverage the API to build your own customized Dashboard of sorts. More API info here: https://documentation.meraki.com/zGeneral_Administration/Other_Topics/The_Cisco_Meraki_Dashboard_API and http://developers.meraki.com/tagged/Dashboard and on developers.meraki.com in general. There's also a "Developers and APIs" room here in the Meraki Community to assist with getting started.