In answer to your questions:
1. Vantage includes a rating system, but it's not designed to be customized or manipulated within the admin dashboard settings. Ratings are submitted only by registered site members.
2. Not at this time, no.
3. AppThemes does not officially support customizations or third party plugins, however your theme purchase includes 12 months of support for functionality of the theme itself and related issues that are not mentioned prior.
4. Not in the sense that the theme would handle multiple subdomains (these would have to be created manually). If you are looking for additional multicity options though, you can find the
Multi-City AV plugin in the AppThemes marketplace to help customers select the location from the main homepage.
5. At this time, no, it's limited to distance and categories.
Vantage is not encrypted, so you are free to modify the theme as you wish, with other addons available in the
AppThemes marketplace also.
Thanks.