Jamba has an option where the team will promote the master to be the leader of the group.
If you switch who the master is, the addon will then have the previous group leader promote the (new) master to be group leader as well.

In my case, my macro's were set up for a party based assist system.
Basically, I page my action bars and have an assist version for when a toon is the slave and a non-assist for when that toon is the leader.
So, my toon switch macro's already had promote to leader scripts built in, prior to using Jamba.

My one macro issues the Jamba command to promote the newly chosen toon to master. This lets the addon have the non-masters follow the master. I use Jamba for the follow feature in particular.
I use the script to promote to leader, as the second line of my toon switch macro instead of the Jamba feature. Works for me, so I never switched to Jamba doing both for me.
I have my Keyclone maximizer region hotkeys on the same keys as my toon switch warcraft macro's. So technically Shift-F1 is a keyclone region key, Jamba master key and warcraft promote script.