When should a question be tagged [feature-request](/questions/tagged/feature-request "show questions tagged 'feature-request'")? Is it correct to use that tag for questions about tag requests, or should it be used only for requests of non implemented features?

My thought is that [support](/questions/tagged/support "show questions tagged 'support'") should be used for questions like "I don't understand how this works on SE; can you explain it to me?" Leaving out [discussion](/questions/tagged/discussion "show questions tagged 'discussion'"), the only obligatory tag that is left is [feature-request](/questions/tagged/feature-request "show questions tagged 'feature-request'").