Then I hope you abide to these "rules", although I have no say in what you can't and can do, follow them, and you can continue using the key.
1) Nothing on the ground is yours, nothing at all. If you need something, then tell me and I shall decide. A simple rule most people remember.
2) Don't ask for a key if I don't really know you. Yep. Or anyone in that matter ^_^ . On the flip side, don't give a key to someone you don't know, you don't have the obligation to, if they unfriend/block you, so be it.
3) You don't use an icon and not tithe it, clean up after yourself. Oh, and check if you have money before tithing...
4) If you use a butterfly, sing to it.
5) The cabinet isn't yours and I rather not have you search the contents of what is 'hidden'. When house upgrades are enacted, I hope a super lock can be bought, along with another cabinet. Or a split one...that has a spinning chamber, that doesn't need a spin animation lol...
6) You do not let anyone follow you and come to your my house and only let them in if their name has been confirmed with me. (Not sure if possible. And even if their on my friends list, it doesn't count.)
7) Don't move objects to somewhere annoying, that's terrible.
8) Don't put more animals in my house, if it didn't have any in the first place then sure.
9) Don't rename my animals for the sake of my convenience on whatever intentions you have.
10) Common sense, but don't touch meat collectors, butterfly milkers, etc. Same thing goes for the machines that I have since they use fuel cells you don't provide me with.
11) Never leave ANYTHING that is edible near the piggies, move them somewhere... that includes herbs ^^
12) Leave your shoes on, I need the dirt.
13) If you nibble or use my animals and trees, pet and water and massage, etc.
This is more of a reminder than a ineffective rule set. And I currently don't have a problem with anyone.
What expectations do would you like your key holders to appreciate?