On Windows Task Scheduler there was a feature which allowed you to add a random delay; so, for example, if I set a task to run at 10pm with a 5-minute delay it would run anywhere between 22:00 and 22:05. The closest thing I could find was the wait task but this isn't random - I don't want to manually keep changing the delay.

Change the Job->Main window->Use run random value.

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Change the Job->Main window->Use run random value.

If I wanted my task to run once every Wednesday between 22:10:00 and 22:19:00, how would that look like? I don't know what to put in the random value box.

Change the Job->Main window->Use run random value.

If I wanted my task to run once every Wednesday between 22:10:00 and 22:19:00, how would that look like? I don't know what to put in the random value box.

Unfortunately that is random and there is no min and max. Just a probability. https://www.visualcron.c...job_-_main_settings.html 

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One way would be to start your job Wednesdays at 22:10:00.
- First task call a powershell script that generates a random number between 0 and 9 inclusive, then waits for than many minutes.
Then proceed with the next task.

Here's the simple powershell script: