Today Ray and I released ColdFire 1.002 which fixes a few minor issues with JSON encoding. If you were having problems with the variables feature of ColdFire this update may fix your issue. Be sure to update both the Firefox extension and coldfire.cfm debugging template. You can get both via the download at RIAForge.
We have also been discussing upcoming features so if there is something you would really like to see be sure to let us know via the RIAForge site.