Grease pencil charector rigging and motion graphics

1. Have a new type of grease pencil layer that would not let the user to draw on the next frames, the user can only edite the curve in the next frames and the in betweenare automatically created, like a vector layer in moho studio.

     GP is very good for frame by frame animation but really suck then we want to rig a character and also have a charector turnaround using time offset modifie. 
   
   

2. please please make it so that we can have effect on a specific layer .

3. more effects in GP .

4. Ability to group layers .

5. Can edit my GP animation in graph editor.

6. time offset modifie can only store GP frames not properties like color change animation or key framing the mask.

I just wish that blender's grease pencil would get better in 2d character rigging and 2d motion graphic.