Thanks for the suggestions. I've logged three feature requests:
- Compact toolbars. There isn't currently an item-spacing setting. A compact layout would reduce the space around buttons so more can fit, while keeping captions readable.
- Segmented toolbar buttons. These would handle selecting one choice from a group automatically, without needing code to coordinate separate toggle buttons.
- Toolbar labels and search fields. I agree these would be useful for adding context and searching or filtering content directly from the toolbar.
I'm keeping one toolbar per window and don't plan to add multiple toolbars in the near future. You can already assign the same toolbar definition to several windows, with each window getting its own instance and event handlers. If those windows need different layouts, separate toolbar definitions are currently the way to do that.