So we have a Thievery skill, why not improve it?
On the Adventure tab, put a new button called "Sneak" this will make it so other hearthlings can't see or hear you, but will still be able to see your shadow. Depending on your Stealth skill, and the victim's Exploration skill, you will either get caught, or be successful.
When you are stealing an item you need time, if your target moves while the action is being performed, you will be exposed and a battle will initiate. You can either just run away, or fight for your life.
If you have successfully stolen the item, a decoy will appear in the victim's inventory. This will last for 5 minutes, enough for you to make your getaway. After the 5 minutes have gone past the victim will be informed that they have been stolen from and like all other crimes, a scent is left on the scene.
So what do you think?