Hello Tim, thanks for asking and I hope you are doing well too!
1. Dashboards are listed alphabetically so you are right, it is not possible to adjust the order of the dashboards. I will create a product feedback.
2. Same as the first suggestion, I will create a product feedback as it is not possible as of right now.
3. If I understood this one correctly, this feature already exists where you can enforce single selection on filters in dashboard. It is explained in this
documentation.
4. I will report this as product feedback as well.
Thank you for all of your ideas. We appreciate it. Please let me know if you have further questions or suggestions. Thank you.