Thanks for the suggestions!
I’ll take a look at #1 to see if there’s a way. You should be able to filter into the defaults to set them to whatever you like using a function.
As for #2, I don’t really believe that share buttons belong in themes – they’re more plugin functionality. It’s something I might add to my Lightweight Social Icons plugin, or create a new free plugin for.
Read more buttons is something I wouldn’t mind adding to GP 🙂