Feature requests around API calls

This plugin has worked perfect so far 🙂 I would like to request a few features:

1) Limit API Requests Per Client: Can you add a text box in settings where we can write what message should be given to the unfortunate user who overused our services?

2) Limit Total API Requests: Can you add a text box in settings where we can write what message should be given to the unfortunate user who experience a breakdown in our financial ability to pay IBM more money?

3) From the above it is obvious that your plugin keep track of the number of API calls and also how many end users they come from. Could you introduce an option to present this highly interesting statistics (preferably a choice to only see them as an admin being logged in looking at your settings page or to actually be able to present them just above the chat box like Total number of questions asked and total number of persons discussed with?

4) Can you introduce a voluntary option of “donating” to this plugin. I would be happy to chip in a little money on an annual basis if you keep doing such a good job. I have seen other plugins having a link on their settings page within WordPress.

Apart from the above feature requests I also have a question about the definition of an “API call”. I assume that an API call is not a session but rather a single question asked. Are Watson’s replies also counted as an API call (doubling the number of API calls)?

The page I need help with: [log in to see the link]