If a user-defined index is created, the dialog box displayed on selecting "Edit
index/table" is missing a number of options which are available for the default
Alphabetical Index:

On the Index/table tab, all of the checkboxes available in the "Options" section
of this tab for an Alphabetical index are missing, from "Combine identical
entries" onwards.

On the Entries tab, there is no "Chapter Info" button (references can therefore
only be to page numbers, and not to outline-numbered paras).  There are also no
checkboxes for "Alphabetical delimiter" or "Key separated by commas"

User-defined indexes would be much more usable with these options.  This could
also be linked with issues 63458 and 61089, which ask for hyperlinked entries in
indexes - when that enhancement is made, it should also be made available to
user-defined indexes.