Just in general on your website, it looks good but there are definitely a lot better PLL algs out there. Check these ones out. In terms of PLL recognition, that's already a commonly used thing but your OLL 1SR would definitely be useful for someone trying to seriously optimise their LL. The 4x4 yau thing isn't very clear, but from the dates on the website I can tell that your native language isn't English and is probably Dutch. From what I can gather though, it's just influencing the edges so that when you solve the centres you skip the edge pairing step, which would definitely be a useful trick in some cases.