:^)

Short anwser:
No.

Long awnser:
It will take a lot of development to optimize the whole thing to be able to support layers. Not just optimization, but general change in the programming on how frames are played. So tons of rewriting the code, throwing the optimisations away, then working on optimising the new code for the layers and playback etc.
There also UI comes into the play, cause it will be mindboggling to somehow put them in without giving new users more white hairs.
And lastly, whole processing power it will require will be insane. A lot of users already lag on few Goku sticks on a frame, and he doesn’t want other users to be left out.

tweening, verb:

Inbetweening or tweening is a key process in all types of animation, including computer animation. It is the process of generating intermediate frames between two images, called key frames, to give the appearance that the first image evolves smoothly into the second image.

Took you long enough.

*sits on it thankfully*