Shift-Click the Mailbox to access the ability to stop need decay for your current household or the entire neighborhood (effectively make everyone happy). Disable Need Decay will make needs stop falling; re-enabling them is as simple as selecting Enable Need Decay. Make Happy will then fill needs to the maximum. You can do this on an individual Sim level by Shift-Clicking Your Sims. This will let you select to make only that Sim's needs static or make them happy by filling all needs. You are also able to completely redesign a Sim by shift-clicking them and selecting Modify in CAS. This takes you to Create-A-Sim where you can make the Sim look however you want, but not change their gender or traits.
To fully edit a Sim in Create-a-Sim, type cas.fulleditmode with Testing Cheats On. This will let you change the gender, traits, everything, and is much more powerful than the scaled down version you get without typing this cheat. Thanks Pokeh321 for giving me this information.
Shift-Clicking NPC Sims will allow you to add them to your household or reset them if they get stuck. You should also be able to enable/disable need decay and make them happy if you so choose - good if your Sim's date has to leave due to being tired! You can also Edit them in CAS if you like.
Shift-Clicking the Ground will allow you to Teleport anywhere you could walk in the neighborhood. Shift-Clicking Objects allows you to reset them, should something get stuck or broken.
Shift-Clicking Objects, for those that can get dirty, allows you to either make them dirty or clean - all objects can be reset, as well.
Customize the size of Items - Enlarge or Shrink - This only works while in build mode, as changing object size requires you to be able to fit it somewhere. Take the object you want to change size of and Press Shift + ] to make it bigger. You can shrink objects down to one tile by using Shift + [ or using Control + Z to undo your changes. Press this too much and it will grow enormously. The controls for this are a little wonky, so experimentation is recommended. I press control + ] then move the object to see the change. This is necessary. Thankfully, if you go overboard like in the picture above you can always undo it and shrink the object down to a size you like.
Reference : carls-sims-4-guide
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