Brief Summary
Suspending tabs is a great feature and when you don't use a low power mode and need to suspend more than one tab it takes more time because you have to right click every tab then tap suspend. (screenshot 1) What I suggest is making an easier way to do the same procedure.

Details:
As an example I could suggest adding a custom shortcut: as an example "Shift + Tap the tab you want to suspend". Right, shift key might be already taken, though we could do something like "CMD + Shift" or "Option", which usually has hidden features.

Or add the same ability to tab overview (screenshot 2). We already have the feature to close tabs there why not make a feature for suspending them? For example a little "–" in the opposite side of "x"

Image/Video:

Screenshot 1 – How to suspend tab feature works right now.

Screenshot 2 – Tab overview.