[Feature request] Add volume button scroll amount

[SkillGG]

Describe your suggested feature

Because it scrolls 100% it may be a bit too much for someone who wants to see the last line of the previous "page". Or it may help with over-scroll on some devices.

Also I like to be able to only half-scroll the screen.

Other details

No response

Acknowledgements

• [X] I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
• [X] I have written a short but informative title.
• [X] If this is an issue with a source, I should be opening an issue in the sources repository.
• [X] I have updated the app to version 1.1.13.
• [X] I will fill out all of the requested information in this form.