The featuredtexts feed of French Wikisource, powered by FeaturedFeeds, has only one new entry by week. In order to have 10 entries in the feed (and not one or two), $wgFeaturedFeedsDefaults['limit'] have to be set to 70.
Documentation: https://www.mediawiki.org/wiki/Extension:FeaturedFeeds
Feed: https://fr.wikisource.org/w/api.php?action=featuredfeed&feed=featuredtexts&feedformat=rss
Version: unspecified
Severity: enhancement
URL: https://fr.wikisource.org/wiki/Wikisource:Scriptorium/Septembre_2012#Flux_des_.22textes_de_la_semaine.22