The Dashboard control is one whole control and if you want to remove the some data you will have to remove the whole control.
You can make minor customizations by going to Administration -> Backend Pages
. For now the dashboard cannot be customized as much as the other content.
Personalization feature ( which is quite complex to be included ) is being logged in PITS
- you can vote for it and track the status of the feature request.
You can also download the University Starter kit and explore it. We have provided custom theme for the back-end. Also as a workaround for your demo, you can go and set users with different permissions for the build - in modules.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items