This is similar to #806232: Site Information Improvements → which is marked as fixed, but the issues still remain.
It would be nice if we could find a true home for these items - removing them from the site information page. I couldn't find another issue that moved these things back on to the site information page, but I do like the idea of adding a "Front page settings" option under structure and would love to revisit the idea in D8.
Needs work
11.0 🔥
system.module
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Not sure I agree this is necessary, but if we do it I think we should have a more generic name than FrontAndErrorPagesForm, perhaps SystemPagesForm? Or we could rename "Site Information" to be more generic so that these settings belong too. Either way, it needs to be rerolled in to an MR against 11.x. The IS needs updating with the template, screenshots, etc