Feauture Request: Add support for subgenre

*I'm submitting a ...*
- [ ] bug report
- [x] feature request
- [ ] support request

## General infomration

### Prerequisites

* [x ] Are you running the latest version?

### Description

Would it be possible to add a subgenre option where you would just put in the ID# similar to how you can with the web browers interface on Netflix

Example:
https://www.netflix.com/browse/genre/10256

The option would be set to default, but could be set to 10256 for Slapstick comedies for example.

If this is not a simple feature request, where could this change be made in the code for users who would like to set it for a specific subgenre.

Thanks,

Gary

The issue names no files, tests, or entry points. Start by locating the repository's existing Netflix genre handling and determine how the default genre value reaches the browse request. Done means users can optionally provide a numeric subgenre ID such as 10256 while retaining the default behavior.

Written by the indexing model from the issue text.