Hello! I'm the one who requested this originally. I assume the notes will have ckeys attached to them, so we can actions griefing notes?
Minor persistance (could likely be implemented without much talk)
I'd like to see command locked boards as a possibility. Swipe a command ID to access them. This can be good for more important style notes in department lobbys.
Sticky notes persist.
Vending machines. Janitors can currently refill them but this isn't done very often. By having vending machines linked to persistance, this would make this done mroe often (and make the commissary more important).
Muck. The obvious one. Gibs, blood, oil and dirt having a chance to persist as generic dirt. Perhaps have a low percentage chance of each tile getting goop based on what's on it. Possibly have the percentage change depending on the round type (so bloodier antag rounds like merc or cult have less chance of it persisting as muck). Possibly have a canon/none canon switch somewhere which rarely allows oil and blood to persist. Maybe let trash persist too? Finally maint should be excempt.
Massive persistance (would require a lot of discussion)
Persistant credit accounts (including departments). These could slowly tick up daily, but would make bounty fulfilment and making credits generally more important. Additionally, tie vending sales to service. Maybe make vending refill cartridges order only.