In general for such key sequences it is always kind of important as every key press is exactly planned/intended by you. Having the sequence consist of only the same key makes it even more important.
When typing words the order of the up events doesn't really matter - you can type "hi" either with h(down) - h(up) - i (down) - i(up) or with h (down) - i (down) - h (up) - i (up) "
I currently also don't have a good way of explaining why that is I'll try to come up with an easy example.
Ok, the main thing is that it works. You can trigger a lot with just one key this way. I can think of a few more variations. Let's see if I can manage the setup. Otherwise I'll just ask you again.