It is possible to set 'Dynamic' captions on several parts in your application, based on an attribute value (For instance: button captions), however this is not possible for tab pages. I see tab pages as place where you would want dynamic captions.
Example: I want to show how many objects in a grid are displayed underneath a tab which is not open, I could use a (calculated) attribute to compose a string value when opening the page and then use this string as caption.
It would also be helpful if the Edit Tab Page is structured the same way as other Edit Pages (i.e. Edit Text and Edit Action Button).
Currently when you double click a Tab Page, 'Name' is automatically selected instead've 'Caption'. Changing this to Caption would save the hassle of getting a validation error because you changed the wrong field. I imagine you change the Caption more than the Name.