This is a very interesting use-case but I agree that Remarkbox is not a perfect fit (at least not yet).

Some additional questions about your use-case:

• Would you need this to work for IOS or Android or both?
• Would you be able to utilize the device "advertisement id" instead of the device id?
• What is the goal of these comments? What would this allow the user to do on your app?

Feel free to reach out to me here if you would be more comfortable discussing this via email:

• http://russell.ballestrini.net/contact/