Since IMO, the main flaw that the JT has is the lack of unique things she brings to a group as a supporter, perhaps she could get a device or line of devices with a new effect. The effect would be called dispel, and it would remove debuffs from any player that's targeted. The device may need a short cooldown between uses, but it would be something that's support orientated, a type of heal (since the JT is a trader), and would bring something unique and fitting for the JT to bring that no one else brings to a group.
If anyone else has any ideas for support orientated equipment for the JT, don't be afraid to propose it, but let's stick to possible equipment items/effects that would be used to help other classes in a group or raid setting. Solo play on a JT isn't really a problem, it's group viablity where she's lacking.
Before replying, please remember this thread is NOT about solo play on a JT or her DPS, but how can she help others, in a new and unique way.