sha256 index?

[Shooter3k]

Is there any way to store the sha256 of files so that when this is run: "dupe:size;sha256" it stores the hash and can be used again without having to regenerate all the hashes again?

[void]

Some suggestions:

Use sha256 sidecar files.
Change your search to:

dupe:size;sha256sumsha256

-or-

Index sha256 under Tools -> Options -> Properties -> Add... -> Select Sha256 and click OK.