Do not report every single post made by a user. Report posts that violate the rules or, if you want a review of their profile/sig/avatar, report a single post with the mention that it's not the post but that which needs review but [whatever]. Definitely report any death threats you get.
Spamming post reports slows down moderators and is unnecessary, and can result in an infraction for abusing the system.
But again, if you're worried about being quoted in signatures, be more cautious about the things you say. Simply quoting you in a signature is not inherently against the rules, although we're happy to review it if you can make the case of how it is being used maliciously.