It would be great if JIRA kept track of whether a specific issue/comment was created directly via web or via email. I need to understand what channels my customers are using to communicate with me more.

Perhaps this could just be a flag/property of the issue/comment that shows up under the History tab as well?

Of course it should also be accessible via JQL if possible so I can use the standard reporting tools for some initial data mining. I would like to be able to run a query and tell easily that X% of my customers are interacting with me via email, Y% of my customers only use email etc.

In fact, it would be great to have a break down of the volume of the issues/comments that were added using REST API or web interface or email or some other means etc...