The Batumi has an add-on module called the Poti. It allows you to instantly switch modes of operation such as the assignable waveshapes as well as sync modes. This can be done without the add-on by pulling the module and adjusting the jumpers. It looks like your rack is full. But if you can swap out something like the Intellijel ADSR for something slimmer and rearrange your modules, you can sneak the Poti in... maybe above the Batumi.

I own both.