Frankly: to me this sounds like a blatant ploy to get the
The short answer is no and I'm marking this status-declined.
The long answer is a bit more wordy.
Voting to close outside of the review queue is in no way a review task -- it's a basic function of being a responsible community member. If you see crummy questions in the course of browsing a site, it is your responsibility as a productive member of this community to downvote and vote to close.
However, by contrast, there are some users who don't stumble across these questions very much but want to help improve the overall quality of SO. A good question requires domain knowledge to answer; a bad question is spotted even by someone unfamiliar with the subject.
The review queue (especially the close/delete/reopen queues) are meant to isolate that critiquing function and channel it into a productive space. Review queues also allow one to make very clear what one's opinion about a question is: a question is worth keeping open, a question should be closed, a question is worth reopening, a question is worth keeping closed, etc. This level of nuance in opinion is not available as part of the everyday usage of the site; I could +1 something but still VTC it, for example.
Why isn't the front page of the site more amenable to nuanced opinions? Well, frankly, that's just too much information for the average user. But a power user, someone who's been around for a minute, can tell that some questions aren't what they seem at first blush. That's why we have /review -- it's an earned privilege to participate in that space, and it asks reviewers to be more nuanced (and thoughtful) in their choices. The main pages don't allow for that kind of evaluation in the same way.
So, no, simply voting to close on main cannot constitute a
/review task. It's not a 1:1 mapping -- the two are in no way synonymous.