Config option to set Splash page for cast type media_player

Feature Requests
1

Would it be possible to add the config option to change the Splash page for ChromeCast?

2

Currently it’s hardcoded but maybe you can change it.
In homeassistant/components/mediaplayer/cast.py
Variable is CAST_SPLASH = 'https://home-assistant.io/images/cast/splash.png'.

3

I saw that and for now that’s what I’ve done but I thought it would be beneficial for others to be able to adjust it easily from within the config.