I don't know if anyone has suggested this before or if there are enough topics, but since there are many subfourms, creating a subfourm for the Lightning Network would be a positive thing, and I'm sure there is a lot of content, so I don't think there will be a problem in creating new topics. The discussions there may be of high quality (if a good manager is chosen) and thus Lightning Network subfourm will be among the best Lightning Network fourm.