You can put your monitors making web calls via http and https into a custom group and then if you open up to the main dashboard and in the 'My Network Contents' resource drill into this new group, it will filter your dashboard to only that group and only show your monitors making web calls. If you add the 'Top Devices by Response Time' resource to that page, it will filter out the response time for these monitors only now.
Thanks for your answer, this works ok.
But still would be nice If I could add this to main dashboard page.
Any hints / or should this be a feature request ?