In response to your questions:
1. If your currency doesn't appear in the currency selection dropdown menu then this means that the default payment gateway, PayPal, does not support your currency for collecting payments. We offer
other payment gateway plugins in the AppThemes marketplace, however you'd need to check each to confirm support for your currency.
2. Aside from collecting money for actually placing ads, yes you can use Google ads, there are banner spaces built into the theme.
3. No, there is a contact form which allows a buyer to contact the seller, but they won't know the email address unless the seller responds to them.
4. No
5. No, this is not a feature of the theme.
6. No
Our themes are not encrypted, so you are free to make modification if you wish. Thanks.