required iOS 7
supports all device
You can choose effect to apply in your device.
If you want to set off parallax effect, you can.
If you want to set on blur effect, of course you can.
iPhone 4 : all effect disabled
iPad 2 : blur effect disabled
iPhone 5s : all effect enabled
...
You can enable or disable effect what you want.
Options for this tweak are Parallax section in SpringBoard settings, accessed via the ControlCenter new button.
If you want to disable Parallax only, you can use another free tweak.