Were old feature requests migrated?
That would be some major effort to sort through all the old entries and find those that are still valid.
Is there a copy from just before features.opensuse.org was shut down that we can access with an opensuse login, e.g. created with httrack? There seems to be good coverage up to 2015/2016 on archive.org, the main page all the way to shutdown, but as archive.org shows a static copy with each page from a different point in time it is not the ideal source for migrating feature requests to the new platform.
On the topic of adding a printer without YaST, I found https://web.archive.org/web/20150921020528/https://features.opensuse.org/ 313287