Doc Scratch has 2 scenes worth of content, to me that's enough to satisfy.

Being serious though, I think it depends on what you like. People say it's fanservicy and I think I agree, it's definitely framed as a fix-it-fic type scenario and has lots of otherwise impossible interactions. If you prefer your supplementary content to be more grounded in logic/canon, then I would advise looking somewhere else.

It's also very closely tied to Hiveswap Friendsim's story, so that's also a must read before doing Pesterquest. Luckily you don't need to know anything about Hiveswap itself to enjoy what that game has to offer. And, wow, that game ALSO has Doc Scratch content! How amazing and revolutionary.