Needing help making edits in Reaper? Setting up custom actions to make time selections (either and individual item or a string) to help save significant editing time. You can create such an action going to preferences in Reaper then selecting editing behavior and finally mouse modifiers (double-click). Then use item navigation and time selection to set the action up. You can further set up an option to select more than one item using the shift key and a double click. Once selected modifications can be made the same way that manually selected items are.
Read more: Select Time Between Items Custom Action