Open For Business
Add NPC or neighbour to family
addneighbortofamilycheat onwith this activated, shift-click on an NPC to add to current (playing) family. ONLY if they are there as visitors rather than working. Eg nanny, maid etc. Doesn't work on the Reaper or Mrs Crumplebottom. (Tends to mess up your game if you move in a Nanny or Therapist.)
To turn the cheat off AddneighbortoFamiltycheat off
Twins
forcetwins Enter cheat and then left-click on pregnant Sim to force a twin birth.
plumbbobtoggle on and plumbbobtoggle off
Wall Placement Restrictions Removed
Pressing the CTRL + ALT keys while trying to place the object will activate the cheat. Placement rules on walls will be removed. You should be able to place any wall object on a wall already occupied by another object. Ideal for placing a light above a painting or dart board etc.
Business Perks
To get all the business perks you first have to have all the cheats enabled.
Boolprop testingCheatsEnabled true.
Once your Sim is at their business, SHIFT and LEFT CLICK on the owner. CLICK DEBUG Interaction.
There are 3 things to choose from: Cheer Up, Give Influence Points, and Give Reward Points.
Click Give reward Points multiple times to get all Business Perk Points.
Go to the "Pick a Business Perk" (where the ranking is shown for your business), and click all the options.
I can't remember if you have to hit SHIFT or CTRL, but keep clicking (even if they aren't highlighted), and you should have them all.