Additional PGN tags

Just wondering how much work the addition of [WhiteTeam "x"] and [BlackTeam "y"] flags would be and whether it is a good idea in respect to Clan matches for collating PGNS?

At the moment if you want to compile a PGN of all completed games of your clan, you have to manually edit each game with the team names.

I'm guessing something like a db2 select and update command might do the trick?