If you have manipulated any control without a 135.293 ride you have broken FARs. This includes talking on the radios. Part 135 requires a .293 check for all PICs and SICs. Therefore, without a .293 check, accompanied with the required training, there can be no SIC time logged, nor can you do anything for the flight. Under 135, you can log SIC time in a King Air 90 provided it is a passenger-carrying flight under IFR, and you have the required training and checkride. Better be careful advertising to the general public that you have violated FARs, especially since you included where you are flying.