Thank you for your feedback.
1. I will look into this.
2. You would only need to enable legacy APIs if you have written code that interfaces directly with the JSON API and this code still requires version 2. If you are using the plugin as-is it is best if you leave legacy APIs disabled.
3. I will do something about this. Fonts on mobile devices usually do not support the entire Unicode space to save memory. Thanks.
4. I do not have plans to improve the exchange’s graph any time soon. I know it is not ideal but it will have to do for now, as there are more pressing tasks.
5. I will try to reproduce this issue. Thanks.
P.S. In the future could you please open one thread per request? It helps with tracking all the issues independently. Thanks.