Currently, if a developer wants to include only those files required for the extensions that are actually used in a project, they have to either figure the requirements out manually, or use the Custom Download tool at http://www.telerik.com/download/custom-download.
It would make the Visual Studio extension much more useful if the same functionality was available there; instead of dumping all of the JS and CSS files into the project, allow the developer to select the wrappers to include, and only include the CSS (and relevant assets) for the selected theme.