I use lots of tabs, and several windows. I also have 4-6 Pinned tabs.
Because of this, I have "Low Power Mode" turned on, from the Tools menu. The way it works is that my Pinned tab are never suspended, and all other tabs get suspended some time after I finish using them.
This does almost exactly what I want, but not quite. I often have the situation where I'm working across a few Windows, and using the content of the visible tab in several windows. And I find that the visible tab in a non-active window gets suspended after a while. Then I lose my place on the page, or the content of a form I'm filling in, or something like that.
I could choose to Pin these tabs, but that doesn't really fit the workflow I want to have.
What I would like is that the visible tab of each Window is never suspended, unless I manually choose to suspend it from the context menu.
This feature would allow me to work with the content of several windows at once, while still enjoying the other benefits of Low Power Mode, to allow me to have the large number of tabs I want.