Hi, I don't think I can help you much;
1. I would look for the text speed by going to the script menu (represented by a paper and pencil) and go to Objects/Object_text to find the place where the text speed appears but I'm not sure if it's there.
2. The letter spacing is not something that can be changed, I haven't found a way to change it. If someone finds a way I would like to know it too.
By the way, if you are using Vray render remember that you can activate the "denoiser" to render; so the noise disappears completely.