Hi,
I never seen a law against a two frequency transmistter in France. I don't know for other countries of Europe.

Really, it's illegal in US to use a transmitter transmitting on 35.160 Mhz and 35.200Mhz simultaneously, while the receiver select the best signal ? (I don't know exactly the frequency range of RC in US)

What's a pity, it could be good for security, if you think for instance of the deadly crash in Roumania this summer during a championship (2 people killed), and for keeping the glue in a corner of our workshop....

"This kit could keep your plane flying while crashing other planes at your club. "
What do you mean ? It's like an autopilot ? If so, it will not avoid the plane to hit something or someone.

Will the optical upgrade need of a firmware upgrade ?

I don't want the twinsync shipped the same day I order it, I just want to avoid to have to send it to you back for an upgrade.

Thanks