Your requirement seems to be a sort of customization one. Plugin does not provide that option by default but it can be achieved by using hooks and actions available there in the code. Using them u can add as many new payment gateway as u want.
Yes that feature is available in GD also.
To enable Neighborhood, you need to go to Geodirectory > Multilocations > Location settings > Wish to enable neighbourhoods
Check this option to enable that feature.