This idea has been developed and deployed to Canvas
In the "old" gradebook, when you were in there and clicked on a button to open Speedgrader, the Speedgrader would open in a new tab. This was great to be able to work in Speedgrader and then close that tab, allowing you to go back to where you were in the Gradebook without reloading everything.
However in the "new" gradebook, clicking on Speedgrader opens it in the same tab. Our faculty are getting frustrated that they then have to navigate back to the course, back to the gradebook, back to where they were, in order to do continue working in the gradebook after they are done in the Speedgrader.
I have suggested that they right-click and 'open in a new tab', at least until this changes, but it seems that everywhere else in Canvas, when you click on a Speedgrader button it opens in a new tab. Faculty are already in the habit of thinking it will open in a new tab. Even if you know to use right-click, if you forget out of habit, it is too late and you have to navigate back again. Can it be the same here for consistency?