<Snipped quote by LegendBegins>
I hope you understand that that's not really a use-case I will go out of my way to support. My proposed improvement to the invisibility system above would eliminate this use-case. :(
The purpose of invisibility-mode is to give people privacy over the exact moment they're online. That invisibility happens to hide *all* activity information was the product of a quick implementation until I could think of a better approach.
If you may be lurking on other accounts, it seems better to reassure people via status and signature. Or even user title: "Not my main account".
It wouldn't be that big of a deal if it was implemented, personally; you may get complaints from people that never want to be seen.