Extended File Templates

Hello

With File Templates I can customize the newly created files in the new dialog. But I want to go bejond the capabilities of the File Templates, for example I would like to have

• autocomplete for classes used as parameters for the template
• more flexibility with variables including altering some of their characters
• scanning current package

Probably that have to be done with some java. Maybe a plugin? Or is there another way? If a plugin is the way is there an example plugin somewhere showing how to create such a extended file template?

Thanks in advance
Stefan