Hi Emma,
sounds interesting, although I suspect it might only be useful for some, there would need to be some way of controlling the default settings for the automatically created sessions - time start/duration etc...
As you mention, the session creation screen does already allow you to create multiple sessions using a timeframe/schedule and we now have the ability to import sessions using a csv file so I'm not sure if the automatic creation would be used more than the existing functionality for creating multiple sessions.
Happy to receive and review a pull request to add this functionality though (or funding to develop it)