Thank you for adding your idea to the Wishlist!
We agree that it would be awesome to have an option to set different font sizes right in the configurator. We’ll try to think this opportunity over in our future enhancements. All the updates will be posted here 
As for the custom background option, you see since we get a lot of requests and the process of developing new features is not easy, we have to be picky and choose the most popular requests first. If this idea is going to gain ground, we’ll try to speed up this process.
I’ll keep you posted in case of any news in this thread - Custom background for the countdown timer