If you're talking about something like this:
http://www.phpbb3bbcodes.com/viewtopic.php?t=213 then I'm sure it's possible. However, as most other things that are requested, the need for it has to be strong enough to warrant its continued support. Arch manages a lot of extra functionality on the forums that has to be updated whenever the forums get updated, and this would be something else that needs to be maintained.
I'm sure it would be neat to have, but I'm not sure it would be used by anyone other than a few select individuals.
*Moved to suggestion box*