Flex searches in English Bibles allow one to find all instances of a word in its various forms ("be, is, was, will be, …"). However, searching a non-English version (a user Bible) with Flex Search is not so easy. One has to manually select all the related words. AFAIK, these selections are not saved. It'd be great if they were! That would be the ultimate solution. Especially if it the created and likely always-expanding list could be shared with other uses.
For highly-inflected modern languages this would be great. And users could share their "database" of related words on the Accordance Exchange. For me the biggest disadvantage of Accordance is its anglo-centricity. Providing user-configurable options would greatly increase its extensibility.