Feature request for INITCAP() function

It would be great if there was a way to set exceptions to the 'word' delimiter list used in the INITCAP() function.    For example, I have hyphenated words like blue-green or possessives and contractions like don't and cat's tail
These become Blue-Green, Don'T and Cat'S Tail.

Being able to pass in a set of delimiter exceptions like hyphen and single quote would make this function much more useful for our specific use cases.