MO doesn't have this because it is not a Stack Exchange 2.0 website. That feature is new, and we are still using the older software. Which I think works fine.
We seem to be a getting a lot of these "why can't we do this?" questions...
It is not an inconvenience. It does seem strange to me that people are asking similar questions all of a sudden. Maybe it is a flood of new interested users (the right kind of users!) instead of the usual "near finals flood of hw questions".