Based on the actual definition of feature-request I believe that all questions tagged request should be reviewed (all (12?) of them), and a blacklist placed on the tag itself. Some questions using the tag would be better with a feature-request tag, or without the tag altogether. Request is being mis-used in place of feature-request and in place of retag-request / synonym-request in many questions.
I see that the request also exists on StackOverflow.SE, and that tag should stay as is (due to its usage for HTTP Requests, and anything to do with sockets (another issue, another question...))
This is not a straight of question, as I bet there is a better solution. Hence: discuss.