Is it possible to set theme for each new site via uploaded file?

Hi All,
I like this plugin. It can help us to create new sites and setup new users for new sites faster than before.
- By the way, I would like to set theme for each new site via uploaded file. Is it possible to do that?

- Could you do me a favour? I'm quite new for the wordpress. I would like to config wordpress multisite to setup the default theme for the new sites. Please suggest me.