Hi,

Here’s a patch that would check org-structure-template-alist for the "old"
format.

It just pops a user-error if the old format is detected (it checks if the
cdr of org-structure-template-alist entries is a list).

On my system, binding max-mini-window-height seems to have no effect.  My
test window-total-height is 35.

    (let ((max-mini-window-height 15))
      (message (mapconcat 'number-to-string (number-sequence 1 15) "\n")))

If there’s any better way to display the error or check if
org-structure-template-alist is in the "old" format let me know.

Rasmus 

-- 
Slowly unravels in a ball of yarn and the devil collects it