Not sure if this is what you are looking for but in xhtml I find really useful the "auto-close" feature in Sigil : type CTRL+SHIFT+. and any tag which is open where the cursor is placed will be closed. Can save a few keystrokes sometimes (blockquote, figcaption...
). You can also do it multiple times if you have nested open tags and you want to close all of them at once (li ul / ol for instance or strong / em / span p or similar).