You could try to write your own Code based on PackageControl to support Shell-Access, but that would overly complicate the Plugin-Installation-Process, since Package-Installation in Sublime Text 2 is nothing more than putting files in its Packages-Directory.
I assume that you want to do this because you want to install Sublime Text on multiple PCs without the hassle of doing manual downloads from every PC.
Just create a fresh Sublime Text 2 Installation, install the Packages you need, and copy the Configuration-directory to each PC. The Configuration is in
~/.config/sublime-text-2
Copying this folder to every PC will copy the Plugins, too.