Sony A7RII and external Flash Af-assist light

I really love the sony A7RII and i use it professionally with several dedicated FE and adapted lenses, what i really miss is a real dedicated pro flash system.  As an event and wedding photographer i made a petition to Sony to enable in some way the ability to activate the external flash AF-assist light.
Here is the link: 
https://www.change.org/p/sony-corporation-kazuo-hirai-enable-the-use-of-af-assist-lamp-from-external-flash-on-sony-mirrorless-cameras?recruiter=297208305&utm_source=share_petition&utm_medium=facebook&utm_campaign=share_facebook_responsive&utm_term=des-lg-no_src-no_msg&fb_ref=Default
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