The jailbreak tweak BeSureBefore has a simple name that explains exactly what it does. Once installed, supported apps can deliver a prompt to confirm various actions, making sure the selection was intended.
BeSureBefore can prevent accidental sending of emails and messages, and can confirm other actions like voice calling and liking photos on Instagram. Settings include the option to enable sound when a dialog box is displayed, or even vibrate when prompted.
Supported apps include the following, with more planned by the developer in future updates:
BeSureBefore is available on Cydia from the BigBoss repository for free. Jailbreak iOS 7.1.x with Pangu to start customizing iOS. Check here for instructions on how to jailbreak iOS 7.0.x with evasi0n 7. You can also find out how to purchase and install Cydia tweaks with this guide.