Force tag on post

[lucky64]

Hello,

I had a look around but was not able to find what I was looking for.
Basically in one forum we would like to be able to force people to attach
one of several 'tags' to the front of the title of their post.

ex;

[REQ]Model for tree
[REL]Blood sprite

And so forth.

Here is an example picture of one forum that does something similar;



Under the 'choose' section.

If anyone could consider making a hack like this...or perhaps knows
of an existing one that I didn't see, it would be much appreciated

--Lucky