Dynamic dimensions

It would be great to have an option for dynamic dimensions in many scenario's.

For example:
- Let's say I'm a sales rep and I want to double check how the sales of my currently selected SoldTo is doing versus all other SoldTo's I would like to have a dynamic dimension with values (Selected & Other). This I could then use in a scatter chart to color the dots for the selected item in a different color
- use a dropdown to select which dimension should be displayed in a chart. This could be resolved with bookmarks, but it would be cleaner with a dynamic dimension IMO