Here are some other ideas I've had for enhancing this module:

  1. Seeing as how Hosting CiviCRM Cron is based pretty closely on Hosting Cron (part of Aegir core), we could probably pretty easily adapt Hosting Advanced Cron Queue to CiviCRM and thus provide per-site control over cron frequency. (see: #1954644: Per-site control over cron frequency)
  2. Right now, Hosting CiviCRM Cron uses the 'wget'-like method of calling cron on CiviCRM sites. However, a more efficient manner exists, using php-cli. This could be an interesting optimization. (ref.: #1613484: Use the CiviCRM cli for launching cron tasks)
  3. Hosting CiviCRM Cron provides several functions that would be useful to any Aegir front-end module seeking to integrate with CiviCRM sites. These could be split off into an API module, and thus re-used across such projects.

I don't really use CiviCRM much myself, but built Hosting CiviCRM Cron over the course of an afternoon Provision CiviCRM sprint at Koumbit Networks. So, I'm not really too sure how useful these would actually be. Feel free to contact me should you want to contribute such enhancements, or contract me to do so.