mtr is just as indespensable tool as the rest of them, and is even installed in a minimal default install. So... attaching a patch I've emailed the upstream author the same patch
Created attachment 124126 [details] patch adding mtr to _known_hosts completed commands
Thanks, applied, this will be in the next bash-completion update.
20050721-4 built and being pushed for devel, FC[34] will follow later.