The following patch adds a Control-L hotkey to Liferea, for marking all feeds as read:
Firstly for version 1.0.27:
image2934 = gtk_image_new_from_stock (“gtk-apply”, GTK_ICON_SIZE_MENU);
gtk_widget_show (image2934);
Secondly, for version 1.2.7:
Both versions apply cleanly to the Liferea source packages in Debian etch/sid and experimental, respectively