Can you please add a separate Casting and Consideration section instead of putting it in the Trivia section.

You don't explain what you mean by 'Casting and Considerations', but I assume it is items like John Doe was considered for the part of Mr Quixley, but turned it down. Why do you state that they are redundant?

I don't think that will happen. Adding a new section can take a lot of time and effort.  IMDb has been working to add new Crew sections (such as Location and Production) for a couple of years now, and have not yet implemented them yet. (I believe they are currently waiting for the move to the new Update system to be completed first.)

Would there be enough items of this type to justify a separate section? Relatively few titles have this type of information available, and most of those that do have only 1 or 2 items. I can't see it being worth the effort.

However, they might be more amenable to adding a new 'type' inside the Trivia Section. Currently they have Cameo (CAMEO), Director Cameo (DIRCAMEO) and Director Trademark (DIRTRADE). It is possible they would allow a Casting Considerations type, which would allow the items to be separated from the general trivia and make them easier to see.

However, to have an chance of that being done, I think you will need to make it clearer exactly what you are talking about and why such a change would be a good idea.