I have received a number of requests from clients to create a custom thread field modification. Much like custom profile fields are useful, custom thread fields would be a fantastic feature. Why? Modifications can use thread-specific data without having to add to or alter the database tables, and this cuts down on a lot of potential headaches. Threads do not just have to be threads any more, they can be whatever you can code them into. Also, things like thread tags and prefixes could be modularized into this single unit.