There is a search function in the top right. Click on it, then search the topic you want. Look through the pages. Don't make a thread for a topic that has been mentioned many times already.
This has been discussed dozens of times, and the answer is no. Sadly, adding dynamic scrapes and scratches would be a huge undertaking and would take a very long time to perfect if it even worked at all.
I never heard about this, I'll have to look into it. I can imagine scratches will be unimaginably hard to do though, especially for someone not on the dev team.