Creating custom vibration paterns for the iPhone in iOS 7

I've created a couple of custom vibration paterns for my iPhone 5C, and I have a fiew more that I want to create. Are there any other options besides touching the screen to make the paterns? I want to creat a vibration patern where it vibrates for exactly 2 seconds and stops for exactly 4 seconds. I also have a patern where I tried to create one continuous vibration while the phone is ringing, but it still stops for about a second every time the patern loops. Any help would be greatly appreciated.