I seem to remember something like that too, either vod or someone making a userscript that can be added to show if a user is banned (and I think number of posts/topics deleted but I could be wrong there)...
That would require an API that provides the scraped data about which users are banned. Thats why Vod and his BPIP backend would be perfect for this.
Perhaps @OP, you could try bumping that thread
That would be necrobumping.
or PM Lauda?
For what? That didnt result in anything, probably because theymos opinion is that its none of our business.