Transcribing then categorizing wills is a big job. If in the U.S., for example, you could have a United States Wills, then organize them into states. So, when someone wants to look up John Doe who died in 1879 in Licking County, Ohio then s/he would go to Licking County, Ohio Wills and find John Doe, died 1879.
If you or someone you know is willing to put in the time and hard work it would be a helpful category.