Would it be possible to add an access key (alt-shift), which would toggle open or close both the header and footer in the Wikisource page namespace? Currently, this feature is available on the enhanced editing toolbar with the use of a mouse, but since our work is keyboard intensive, this access key would be most helpful. The gain would also be additional vertical screen space.
I perused the list of assigned keys of the wmf Manual:Interface/Access keys and concluded that there are only two characters of the alphabet (g and m), and none of the numbers (0 to 9) assigned. If this is feasible, any available key assignment would do.