This sounds like a great practice to do. Which Sutras are you copying? I guess that originally shakyo was not only a practice to accumulate merit and developing a deeper understanding of the texts, but also to spread the teachings by making them more accessible. In that way a modern form of shakyo could also be useful. As there are many Buddhist texts, which are not yet available online, one could also copy sutras and upload them. Though I am not sure, if there would be a copyright problem.
We copy the heart sutra, but in essence, any sutra can be copied. And it doesn't have to be in Japanese. It can be Sanskrit or English. I've found my mind tends to wonder more if I'm copying in English, and I tend to thrash it out quite quickly. I don't that's do to with the practice itself, but more my own mind.
What Huseng said is what I've been taught. However I was taught that copying, although for reproduction was also seen as a meditative practice. How true this is I guess well never know.