QNetworkDiskCache: Split disk cache space

We found a issue in http://youtube.com/tv
If we click a video clip. Browser receives video and audio files.
(Youtube sends a small chunk of video files many times for one video clip.)
These video and audio files are all cached in disk.
It is a problem in embedded systems which has small disk cache space.

Size of video and audio file is so big.
It consumes all of disk cache space after 1~2 minutes.
And other files (.html, .js, .jpg, and etc) are evicted from disk cache.
It makes web page loading slower.
This can be happened in other web page as well as Youtube TV if video/audio files are cached.

I suggest "Split disk cache space into Video/Audio and Others".
So I want to change disk cache heuristic which "other files" can allocate disk cache at least ??%. (I will determine threshold later.)
How do you think about this?
If you agree, we can implement.