Noted!
The functionality to change the electrode element is not really needed, as such. You can (and should!) always prepare the electrode before, in the Bulk Builder, and then bring it into the Atomic Manipulator for cleaving. So, in the AM, the only operations needed are those of relative alignment plus adding surface layers, etc. Same for the central region, you don't really build it in the AM (unless it's very simple), you bring it in as a ready molecule or slab material.
Thanks for the feedback, it's much appreciated to learn what users think of the specific features etc! More, please!