Could the "Read" page tap-hold>Find feature have an inexact search option so that finding "remain" would also find "remaining", "remained", "remaineth", "remainder"? I know that in some cases many extra unrelated words might be found (e.g. "count" would find "counted", "counting", but also "country", "countries", "countenance", "encountered"). But still, this might be nice to have even though the Search page is able to do this already.

Interesting idea -- but would you propose that it always work like this, or via a switch, or that there be two different [Find] links?

Here are some ideas. I don't know what would be easy or practical to implement or how well it would integrate with other features.

There could be two "Find" buttons, one for exact, one for inexact. Or maybe provide a mode switch that is set in the tools/option page as you suggested. Or maybe better yet, just double tap "Find" button. But having two buttons would make the user most aware of the feature. Perhaps the second Find button could be placed under the original find button or in line with the others. I don't know what would be the best arrangement.

Something like [(X) Found: "count counted counting counteth encountered countries country" - Gen(27), Exo(3), Lev(8), ... could be displayed within the text.
Tapping words in the list toggles their selection and updates counts. (Counts that go to 0 could be deleted/reinserted or retained with 0 or non-0 count.) As word selections are toggled, any book(count) items that are expanded into book/chapter/verse list or any book/chapter/verse list items that are expanded to actual verses could be dynamically updated in some reasonable way. This would be the fullest blown implementation I can think of at the moment. Maybe others have other ideas on how this could all work.

By the way, I notice there is a red opening square bracket at the start of search results. I don't know if it is intended there be a closing square bracket somewhere.

One more idea. Perhaps there could be just one Find button. Then double tapping a matching word in the list selects it and deselects all the others in the list.