You can use the Business Add-In BADI_WSD_SEARCH_RESULTS to create new pushbuttons in the search result toolbar of the Enhanced Material Search function. You can use such a button to trigger a function in the search result list.
There is no active BAdI implementation in the standard system. However, the example BAdI implementation BADI_WSD_SEARCH_RESULTS_EX shows how you can create new buttons to trigger the following functions:
Display Material
List Material
Display Scales
Display Images
Display Images in Browser
Display Material View
Display Stock Overview
For more information, see the documentation for the example BAdI implementation.