We decided to make SimEvents more consistent with Simulink and use normal In and Out ports.
Like with Simulink, to position inputs to different sides of the subsystem, you have rotate or flip the block by right-clicking on it and choosing "Rotate & Flip" and then choosing the position you want.
This, though, will keep all inputs and outputs together. I'm not sure if you wanted to move inputs and outputs to different sides from each other. Let me know if that's the case.