I suggest a small tweak:
Being able to set the bullet behavior's initial angle of movement in the properties bar.
Unless I'm missing something, currently it's hard coded to 0 degrees. So when you just want something to go across the screen from any direction other than left to right using bullet, you need to set the angle of motion via the event sheet.
Implementing that would make the above slightly more convenient and would make the event sheet slightly less cluttered.