Custom project type

In RM 4.5 for the new project I can specify on the types: Empty project, Rails application,  etc ....

Question: is it possible to create my own type of the project (template?) with different settings ?
For example, I often create Rails application with Cucumber + RSpec testing frameworks and Mongoid as ORM. That requires some additional flags for rails generators and some customizations to different configuration files. So, is there some way to predefine such custom template (or I need to write plugin) ?

Thanks in advance,
Denys.