Ability to group timeline panels into folders

[defaultm6mmqlb6r1g9]

Having to do re-versions is becoming more and more common (social media reosloution, resoloution and colour space for TV deliveries), it would be great if we could group timelines that appear along the tabs across where we keep sequences. So for example having a timeline panel saying, HD, 4K, HDR, and then click into that and then be able to select the correct timeline. 

Thanks