I took the source project and added my own Start/Stop/Pause buttons (as found on TurboWarp). After starting the project with the Scratch Green Flag, use the project's Start/Stop/Pause as you would expect. Once running... Click anywhere on the stage to attach a rubber band to the ball. Drag it anywhere. Release it anywhere. Adjust the tension of the rubber band as desired. To use in other projects, just backback the "start/stop/pause" sprite.
It was a very simple project to add it to, but I may use this in the future when there may be a desire to pause a time-based game (washroom break? LOL). This version is documented and "backpackable".