The more I look at this, the more I think we should skip it. It looks pretty tacky with an extra row when it appears that it will fit with the others. And if we shrink the padding in the main row, it only allows for one extra glyph. That means plugins could create issues with each other.
And if we think about it, the three glyphs that are there don’t cover all the options from the user activity page anyway. They are simply the most common (and standard) links. I’m not sure many plugins will hit that status. As much as I’d like to think the voting plugin is that important, it’s likely not to the majority of users. One extra click from the activity page isn’t a big deal.
Sam already merged the PR for user-activity-bottom. I’m going to run with that for now and if we can find a better way in the user menu, I’ll jump on it. But I’m not sure it’s worth it.