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Thanks for clarification.
I agree it is possible. but without any documentation it is very hard and requires digging deep into sources.
How to make sprite animation visible while editing entities in editor? If there is no possible way, this has huge impact on designer workflow....
http://u3d.as/content/space-invaders-team/space-gravity-2d
For toggles you can use OnClick event of EventTrigger component instead of OnValueChanged. It solved loop problem in my case.