Batch rename only offers Original case, Uppercase or Lowercase options. I believe that it is long overdue to have either Sentence Case and or more intelligent Title Case/Proper Case. Bonus points if there could be an underlying preference text file where one could build a dictionary/library lookup to handle special cases.

A couple of example topics:

https://community.adobe.com/t5/bridge-discussions/batch-rename-options-to-change-case/td-p/12654840

https://community.adobe.com/t5/bridge-discussions/using-batch-rename-to-change-filenames-to-title-case/td-p/10393150