Would it be possible to make zombie passers-by actually come into one's house (in search of 'mowe bwains' obviously) without ever stopping to ring the bell (kinda like outgoing sims - they just barge in and head stright for the pool...)? That'd be fun. Also, I noticed sims zombified via "Eat Brains" do not have their personality twisted. Is it supposed to be so?

Works for me.

Inquiry: how do we un-bork the already borked tiles?

Tippingfix.package seems borked. Playing for tips on a violin renders the tile under the jar permanently unusable. This was fixed in the official Free Time patch.