Here are some suggestions of mine:
- Customize how this Approve Edits button appears. A more generic version of (2).
If I want a different background, I should be able to set that. White on black should look less disturbing. Other people may find another color works best for them. White on grey, white on brown - anything that fits other elements on the top bar.
If I want to hide it altogether, the system should let me do it. Seriously, if I prefer answering questions more than reviewing it, why force me into it?
Okay, okay, as a compromise decision to the previous, the system may show this icon once a day, so once I review anything, it no longer shows until next day. An extension to (3).
I decided to post my ideas as an answer here - my question was closed as a duplicate of this one.