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That's great! Looking forward to your research~~~

Well, I mean I want to use a wireless TTL flash as a TTL flash on the top of the camera.
When you take photos outdoor, you need a TTL flash fixed on the camera instead of a TTL radio transmitter and a  wireless TTL flash...

I'll upload some pictures to show  how to achieve this effect  later.（My method can't firmly  fix the flash on the camera,so I need a better way by software...  ）

When something connected to the hot shoe of Canon 600D，the camera will automatically disabled the built-in wireless flash function, Can it be a way to stop this  disablement？(that is,I hope that the camera  will recognize  there's no flash installed on its top)
If some  flash light with wireless TTL function, which is not made by Canon(and the price is much cheaper), can be connected to the camera and still be able to use  wireless TTL function，it will be great(it can be used as a real TTL flash light).
I really hope the new Magic Lantern firmware can achieve this function，and it's very useful. I wish you to consider my advice，thank you.(My English is not good enough...囧，I don't know wether it's appropriate to post the topic here either ...)