Here’s a quick tip that will let you set a password for any app purchases or deletions, as well as in-app purchases.
- Go to Settings
- Enable Restrictions, use a good non-guessable password
- Turn off Installing Apps
- Turn off Deleting Apps
- Turn off In-App purchases
- Click Require Password
- Set Require Password to Immediately
Once this is done, only someone with the password will be able to delete, install or buy in-app purchases. Easy!