It can be very useful if you could add some extra custom buttons on this toolbar, right ?
YES, you can do that. This framework supports that. In your TaskIndex class, you just need to override another method that returns a List of UserToolbarButton types. Just follow the following code screenshot.
Now, if you run the Visual Coded Task Runner, you will see your new button on the toolbar as follows:
Lets add another button for opening internet browser with Google.com.
After adding this code, when you run the Visual Coded Task Runner, you will see the new button as follows: