Question #1 solved by browsing forum history. Problem was when i have two language site, did i need to duplicate template overrides for each language. The answer is no, and it is solved in site.ini.append.php. So, for english (default) site there is config:
second line in serbian setting tells ez to search templates for serbian translation in sr/ design and if it does not found - look in en folder. Works perfect.
Still remains problem of mixing host and uri match for the site. Anyone can help?