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FlyingKatsu
For the frame delay, you can set it in the FrameEdit panel:

Not sure how useful it is to have an "Add Frame" button since the simplest implementation would be to just increase the canvas size by 1 tile height in the y direction (if you increased it in the x direction, you'd have to reorganize all your frames). Could be useful if you only have one animation, but if you have multiple animations in the same canvas, the program would have to guess where on the canvas you want the new frame to be placed. Wouldn't it be easier to assume you need extra frames from the start?
Not sure what you mean by "sort layers base," but if you just want to label what's in a layer, you can change it's name:


Not sure how useful it is to have an "Add Frame" button since the simplest implementation would be to just increase the canvas size by 1 tile height in the y direction (if you increased it in the x direction, you'd have to reorganize all your frames). Could be useful if you only have one animation, but if you have multiple animations in the same canvas, the program would have to guess where on the canvas you want the new frame to be placed. Wouldn't it be easier to assume you need extra frames from the start?
Not sure what you mean by "sort layers base," but if you just want to label what's in a layer, you can change it's name:
