Yes, you can query and select objects on the PCB using the PCB Filter tab, then use the PCB Inspector tab to modify parameters about those selected objects. When using the PCB Filter, make sure that the "select objects passing filter" and "deselect objects not passing filter" check boxes are enabled. (You can configure the mask/zoom options as well if you want.) Once the objects are selected using the filter (or are manually selected), open the PCB Inspector tab to make changes. At the bottom of the PCB Inspector, it should display the number of objects currently selected by the filter query. At the top of the PCB inspector you can further limit the scope/type of object you wish to make changes to. If you query was detailed and precise, then leaving it set to "include all types of objects" should suffice. As you make changes to the parameters listed in the inspector, those changes will be immediately applied to all the objects that are currently selected (and match the type of object defined in the PCB inspector object type).