Hey Daniel!
I don't know enough about the chronology of the Krameterhof to answer your question fully but I will share what I know.
1) Sepp is not afraid to use appropriate technology to work with the water. He has used all sorts of different technologies to move water uphill and the ram pump is certainly one of these. The one that he is currently most excited about is his dragonfly. This is still in the model phase but last time we were in Austria he showed us a model of the concept. He plans to purchase an old helicopter from the military, and this will serve as the body of the dragonfly. Solar panels will form the wings of the creation and the tail is a barrel axle wind pump. Under the base of the dragonfly is a ram pump so the creation uses Sun, Wind, and Water to move water uphill. There will be a boardwalk above the water to the helicopter, with a small cafe inside the helicopter for people to enjoy. The big thing here is because it is a piece of artwork within the strict regulations of the EU he can put it wherever he wants.
In Montana we showed Sepp a
High Lifter Pump and he was quite impressed. They have two models a 4.5:1 and a 9:1. They function like this: for the 9:1 it pumps 1 part uphill for every 9 parts downhill and pumps the water 9 times as high as the fall from the source. I've been told this is an efficiency increase over the ram pump and a big advantage is that they are quite. The ram pump makes quite a loud knock every time it pressurizes the water for uphill travel. This might help keep the operations covert at night.
2) I'm not sure how he started at the Krameterhof but his approach now seems to be to start at the bottom and build the biggest water retention possible. This may even take a number of years to fill and can be used to bring water to other areas of the property. He did make sure to buy all of the water rights he could early on at the Krameterhof, this ensured legal access to the water for everything he wanted to do. I think it was just springs and surface rights that he purchased from the neighbors but I am not positive about that. The water retention spaces will certainly reinvigorate historical springs that can be cased for drinking water or other uses.
3) You have to have some pretty steady and strong flow for hydro power, it sounds to me like you don't have enough flow to bother with it. I'd imagine this came at the later stages of the Krameterhof, once the financial resources were in place to put in a system like that. Your flow will certainly increase with good permaculture, but even then 1gpm is not much to start with for hydro. Does it flow year round or is it seasonal?