https://extensions.sketchup.com/extension/fb385104-103e-4176-b1e5-92e114bad57a/eneroth-tool-memory
Similar to how Alt+Tab cycles applications in Windows, this plugin can be used to cycle recently used tools in SketchUp. This can greatly speed up and streamline the modeling process, especially for tools that aren't used enough to take up a custom shortcuts, but used too frequently when used to be manually located in the menu each time.