Add shorter time intervals to Drupal cron options for faster indexing

#11 appears to have been committed. And with no movement in 10+ years wonder if this is still a desired feature?

I would love this feature to be part of core. I understand 1 hour is enough and it should be per default but why not allow more options?

My understanding there could be performance issues for going shorter. That said there are modules like ultimate cron that allow for more control.