How can I change the code template SnapDevelop uses when I create new "API Controller Class"?

Initially I want to

• decouple action names in route from method names in the controller
• - and - rename HttpPost method Update => Insert
• - and - rename the HttpPut method Add => Update
• - and - add an extra HttpPatch method => PartialUpdate

Later maybe add my own custom templates, like add extra decoration for [Route...] and [Produces...].

I expect some file somewhere contains the template. But I don't know where to search for it.

TIA /Michael