Android 6/B371 firmware questions

Hi, I just received OTA update to B371 firmware but the new Android 6 and EMUI 4.0 changed few things:

1. It is no more possible to "zoom" email notifications in the notification area to see the list of last emails and email previews. Is there any way to reenable it again?
2. The volume of the "click" sound is controlled by the ringtone volume. Is there possibility to lower the volume?
3. How to enable a "click" sound for the dialpad? I found only the dialpad tones.
4. I found a way to remove the white background on google apps icons via modifying the theme icons, however the play store icon has still the white background. Is there a possibility to configure a theme to not to modify the google icons?

Thanks for any help.

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