There is kbin-link that reformats links to match your home instance, works for kbin or lemmy
https://addons.mozilla.org/en-US/firefox/addon/kbin-link/
for kbin specific stuff kbinstyles magazine has a lot of good stuff. Especially like kbin enhancement script
https://kbin.social/m/kbinStyles
It honestly would be a terrible idea to allow some cross instance moderation to help ease the load. It would just require a lot of trust.
Edit: yes I meant wouldn't ^. don't want to change it now.