Shortcuts to twirl and untwirl layers
As explained in this video from 2:26 to 5:00
We need THREE shortcuts in total:
1. Twirl DOWN the current layer under the cursor
2. Twirl UP the current layer under the cursor
(For both of those, you should be able to simply hold the key down while moving the cursor across the timeline, instantly closing all layers the cursor touches.)
- TOGGLE the twirl status of the timeline layer under the cursor.
(This shortcut would probably need to be pressed each time it is used.) It is extremely important that this NOT be the only shortcut for twirling. We absolutely also need the two shortcuts listed above! I cannot stress enough how important that is.
ADDITIONALLY, for these shortcuts to reach their full potential, we need a sublt but important tweak to the way the timeline reacts when twirling layers closed - it must not move! Please see this feature suggestion for a full explanation, with video! https://adobe-video.uservoice.com/forums/911311-after-effects/suggestions/35487148-timeline-layers-should-not-jump-downwards-after-a
The shortcuts U and UU are insufficient for this, since they affect all layers at once, OR they require a layer selection in order to work on just one layer.
Also, U and UU cannot be used to open up layers that have not yet been keyframed.
CTRL ` might seem to cover this one, but it requires that the user CLICK to select the layer first. This can lead to accidentally moving that layer to the left or right, if care is not taken to keep the mouse or wacom pen perfectly stationary. This means that twirling multiple layers one after the other is prohibitively slow when using CTRL `
I hope that the linked video demonstrates just how useful it is to have the shortcuts I am talking about here. (Again, please note that a toggle shortcut alone is very insufficient.)