I'm inches away from being able to use Zoho Creator as the back end for my clients project. It would really be great if we can solve the following three issues; even with some kind of workaround.

1. How would I go about using the API to submit data to a subform within a parent form as opposed to accessing the subform form directly. I hope that makes sense! The difference is that when adding a record in a subform it, quite rightly, doesn't treat the subform record as a new record but instead a part of the form within which the subform was placed. Example: A contact database with a subform to record each call made to that contact. I want to avoid increasing the record count when adding a new call against the contact.
2. Is it at all possible to somehow link a record with an email. For example, if the client uses gmail; is it possible to view all emails from a certain email address from within Zoho.
3. Finally, I'm having difficult finding out how many User Document Sessions (API Limit) I have. Where could I find this information and how would I go about buying some more?

Jordan