I wouldn't recommend pruning them would look very odd.

Yes you can, in fact many of the taller upright growing varieties actually benefit from the practise as it can help make for a better shaped tree in the long run. Side branches can be cut back to any given side shoot axis, this should be done around April, new buds will grow from this point and will help to make for either a bushier or more uniformly shaped tree. Also very common for secondary leaders to appear, which should in most cases also be removed.

Thanks Bluespruce, Could i send you a message? Couple of conifer questions.

I would look for one of the many dwarf or narrowly columnar varieties, though that could take some searching. Keeping a natural shape with pruning takes considerable skill.

Not really Tugbrethil, its just usually a case of selective pruning only, and getting to know the trees a bit in question..
Yes you can message me if you like Japon.

True, Bluespruce, but you and I have a good knowledge of the growing habits of that type of plant, and had years of practice at pruning them. I've found it very difficult to pass that knowledge on verbally! Especially nowadays, when people seem to think of pruning in terms of hedge shears. Someone could learn the hard way, like I did, but some mistakes take years for the tree to recover from. Still, I am being a bit too discouraging--it is a skill that can be learned, and it's really not all that hard. Just learning a new set of techniques, and a way of looking at plant growth.