In a multi-user environment, our testing has shown that while there is some room for improvement on the Data Archive read cache, the Windows file system cache does a pretty good job.
In our conversation with customers, there are very few that would want to manually prioritize what gets loaded into memory as that usually only optimize one operation or use case but reality is that the great majority of Data Archive installations are for multiple users each with their own needs and use case.
With that in mind, the effort does not justify the benefit for all our customers across the board. As such, we have no plans to implement this idea.