Maybe there already is the functionality I'm looking for, but I didn't find it.

I'd like to be able to search, filter or sort the pools (https://e621.net/pool/index) by their creator. Since a lot of pools are comics we'd be able to have all the comics by a specific artists in one quick look.

If anyone knows how to do this with the current e621 build, please tell me since I didn't find it.

You could potentially use inpool:true narse to search all the pools for artist names. I've never tried it but it should at least bring up all the posts that are in the pool. It may take a bit to figure out what they are in though.

A slight alternative might be to add user:parasprite, assuming the user actually uploaded the images. I'm not sure how much that would help though.

That would be useful, but right now a good search engine for pools seems to be "on the agenda." I think it'll happen eventually, but it might be a while!

Edit: However, this should probably be in the feature request thread :P