Yes and?? Just because it apparently doesn't say in a generic manual then that's the law! You've just stated you wouldn't put a repaired tyre on the front yet you think it's acceptable to put a spacesaver on the front. I know which I'd rather do but everyone's different.
I'm not going to get into a debate with you, you said I was supposed to put the space saver on the rear not the front, but that's simply not true.
A space saver is a short distance journey remedy to get you home and/or to a garage, which is what I did. As per the advice (and being sensible!), I did not drive the car hard or with any vigour when on the space saver, I coasted and drove conservativly 5-10 miles to get home and then to the garage this morning which is a mile away.
I mentioned what you said to the tyre garage and they said it's absolutely fine, no need to have it on the rear. The space saver in the Golf is an 18" wheel with appropriate profile to match my 19", so there's no imbalance.
Anyway, I now have a new tyre fitted and all's well with the world.