I think this would be a real benefit. Firstly, if you have 3 graphs on one dashboard the tools icons on the view toolbar become quite small and difficult to identify and secondly, not all the final users of the dashboards are very adept at using all these functions.
Ideally end users should only be able to see tools which are relevant to the data in the form it is displayed. Too many options will only confuse them;)
This feature has now been implemented starting from 2.8 build 239 onwards.
You would be able show/hide toolbar items in the following ways:
Right-clicking blank space on the View toolbars.
Right-clicking on the the toolbar button.
From the "Toolbar items" option located in the "Tools" menu located in each View toolbar.
Note: The menu only shows the currently visible items on the toolbar. You can control visibility of any future buttons that appear when you have a certain configuration by ticking and unticking the "Default" option.