Default "Using" namespace imports, and Templates in General

Is there a way to cause Rider to include "using" statements for a list of namespaces, such as System and System.Collections.Generic, in every new code file by default? 

I tried using the templates from (context) -> Add -> Edit File Templates, but I ran into several problems with this:

• I don't see a way to insert the proper namespace statement based on folder nesting into a .cs file template
• The newly created .cs files are created on the filesystem and added to source control, but not added to the project or given a compile mode
• Rider doesn't use my template for files created automatically, such as when I use the move refactor to send an inner class to a new file.

Am I doing something wrong? Is there some other way to get the IDE to include packages by default?