Unfortunatly were only going to support US and Europe for a number of months and only through the mapping data we provide (mappoint). We are considering internationalization, but have no concrete plans yet.
StreetDeck does not support running arbitrary windows programs in the foreground (at least the GUI part of them) while the car is in motion. This is what map monkey and destinator would fall under. The SDK will allow you to add other functionality to the program though, which could potentially be a different mapping program, but it will require you to use the StreetDeck interface through the SDK to maintain consistancy and usability.