Added:

Preview slider synchronization toggle: This toggle shows up when editing an existing BlendShape and syncs the preview slider with any game or plugin slider that would set the value of the BlendShape normally, so that you can use the game's own controls for getting a feel of your changes in while in the editor. By @deadshark3d
Overlay hide toggle: added a small toggle between the Vertex-Dot and Wireframe culling mode switches that disables both completely. This button also has a configurable shortcut key (default: [space]).

Changelog Update 0.5.0

Upgraded to BSC's new API for registering BlendShapes.
New feature: Edit BlendShapes
- Renderer's that already have BlendShapes have an new indicator in the list.
- Selecting on of them will reveal a new menu at the bottom where you can choose an preexisting BlendShape to edit.
- The deltas for the chosen BlendShape will be imported as a layer into the editor. You can edit on top of this edit or remove it and create your own edits.
- The deformation state that you seen when you click bake will become the new 100% state of the BlendShape you opened.
A new slider to "preview" the edits you made without affecting the layers of the deformation when baking was introduced.
A new toggle to enable/disable normal recalculation was introduced.
- Previously normals would always have been recalculated for the affected vertices. This caused problem on some meshes like the face.
A new mode for the wireframe was introduced to hide it everywhere except where you are editing. (Similar to the interact only mode for the vertex dots)

"Hide" button (H) on the layers that hides the layer without affecting its weight or its contribution to baking like the preview slider.

This requires the new v2.0 of BlendShapeCreator