By default, Javatar is not include any additional packages inside its package. This helps Javatar faster to install/update from Package Control but that not provides any support for some features (for example, Organize Imports). To solve this problem, Javatar will automatically download and install necessary packages when startup.
For other packages, you can download and install using Packages Manager... > Install Packages... menu.
If you want to suggest or add Javatar Packages to the package repository. Please leave an issue in Javatar Packages repository.