Feature Request: configurable time before text fades out & chat font size issue

Love the addon!

1. Please consider adding option to set how long new text stays in chat before it fades out, similar to prat functionality.
   For example I want to set it to 15 seconds, so I can glance at it, then it fades out for immersive experience.
   Current time is a bit too long for my tastes.

2. Setting font size to 13 does not work after /reload. Blizzard chat only allows font size of 12 and 14. I guess due to this the setting gets reset. Any simple workarounds?

Thank you.