Hi Stephen,
What you're looking for can definitely be done.
Clone the filter "Filter vFilers by name in array" and modify the SQL query to case the column name and string, in your case it is the vfiler name.
Basically, you can modify this line in the filter query -
AND vfiler.name = '${vfiler_name}'
to,
AND upper(vfiler.name) = upper('${vfiler_name}')
You can now use this filter for case insensitive vfiler name matching.
Regards,
Tanzim