Hi Alexender,
Thanks for the suggestions! Would you be willing to add these to our feature request forum? That will allow us to keep all our feature requests together and let other vote on the idea as well.
When you post the idea, it would be great if you could add more detail about how the field security would work — for example, are you looking for a reCAPTCHA level of security for all for data, simply obfuscating the email address, or some other method? Let us know those details when you post the thread.
Thanks so much!
Geoff