The pyvista, stc plotting is great and already really useful for reviewing data.

here are a few thoughts (in no particular order) I've had using it as part of an analysis pipeline for the last week.

1. there is no brain.remove_labels() which is mentioned in the add_label docs.
2. It would be useful to return vertices that are interactively added using timeviewer. This would let you save these points and later use them for analysis.
3. is it possible to link two timeviewers so they share the same point picking and optionally the same camera/view. I wouldn't want them time synced (at least not by default) so you can look at different types of stcs.
4. I wonder what the opportunities are for adding labels and having time_viewer display their wave forms. Exposing the parameters for extract_label_time_course via the gui might be a pain though.