FuseDesk helpfully remembers the last country and timezone that you use each time that you add a new contact.
This way, when you come back to add a new contact, the country and timezone will be preset to what you most recently used.
To see this in action, click New on the navigation and choose Contact.
Alternatively, click Contacts on the navigation and then click the Add button.
In the new contact window that opens, simply set the Country and Timezone for your new contact and click Add New Contact.
Now, repeat add another new contact.
Voila! Your country and timezone are preset for you!