Especially when using CC4 characters the menu interface is almost unusable for managing assets.
Apart from the fact that is opening on a different screen than the timeline is, you can only scroll through it with mouse wheel or keys but lot of time it gets closed unexpectedly.
Also characters will get separated into its parts which will make it impossible to manage.

My suggestion would be to implement the Track menu functionality into Outliner or "Scene" window where you could set if its visible in the timeline by clicking condition icon next to the asset and it would still be grouped in some logical structure.