First, what is one click trading? I never heard that type of trading. Maybe you're referring to the execution of trades. Second, there's no instant execution of trades due to the volatility of the market and lastly, If it is existing, then I think it is dangerous to open a deal with because you can make an amendments nor change your orders if you have a second thought.

Impossible to find a broker that has a one click trading because of the unstable trading servers.