My graduate student Alexander Schubert and I have developed a jsui-based timeline replacement. It works in conjunction with a bpatcher which contains a coll object that all events are written to. The timeline object itself acts as a visual editor for the coll messages. This object was created for those of you that still miss the old timeline object.
We would still add a few more features, but the object already does what it was designed for and runs stably.
We appreciate your feedback.