When quizzing kanji, one of the features on the answer page is a link to "show related vocabulary". This is extremely helpful and I really appreciate it. Is there a keyboard shortcut to expand that feature or is the only option to physically click it?
No keyboard shortcut, sorry. If you want it to always show the terms, you need to use the site settings (the gear icon in the upper right) Then choose Term Lists from the list on the left. You can set the number of terms and the filter (if you want one)