Heya!

Jamba alone will not give you this functionaly. Jamba mainly deals with "quality-of-life" type things, such as taking the same flight paths, accepting/turning in quests, etc.

What you need is multiboxing software. I.e: a program that will allow you send to commands to both/specific game windows. What you are describing can be achieved with any of the common ones out there. ISBoxer does make things a bit easier as it handles a lot of the assist/follow functionality for you, but free alternatives such as Hotkeynet will work fine as well.

How exactly you would set this up is very dependant on the software you choose to use, and what you wish to do with your characters, so I won't go in to detail on that without knowing more of the specifics.