1. The only problem with not using any other activation technique and going straight to rapid reading is you have not got the variety of speed options you have once you learn and apply superreading and dipping, skittering, mind probing. So essentially all you are doing is PhotoReading and then traditionally reading, perhaps a tiny bit faster than your normal traditional reading because it's as if you are reading it again. To call what you are doing rapid reading is a mistake.
Rapid reading includes Superreading and dipping, skittering and mind probing.
2. You do need to train the body mind connection so you still need to work on manual activation. If you have used manual activation and then PhotoRead 3 to 10 books a day for 2 or 3 months your chances of spontaneous activations are greatly improved.
3. See answer one. You' are already just reading so it's the same.
4.. Your purpose has to be meaningful to you. If you can see in your minds eye yourself using the information in some way then that is your purpose. If your purpose statement does not do that for you then it's a poor purpose.
Alex