You can set up a different vagrant path if your Vagrant binary is not installed in the default location, or you're using Sublime-Vagrant on a windows machine.
{
"vagrant_path": "/usr/bin/vagrant",
"vagrantfile_path": "/vagrant",
"additional_args": ['-h', '-v'],
"output_to_window": true
}
By default Sublime-Vagrant will scan your first open folder and traverse up from there looking for a Vagrantfile, alternatively you may provide the "vagrantfile_path" setting which allows you to manually specify a relative path.
There are very few additional arguments you can pass to Vagrant so by default there are none in the setting file.
If you submit any bug fixes or improvements, don't forget to add yourself to the list of contributors.