Here are a lot of small ideas to improve the command prompt.
Fade time
Add to fade out and fade in a numeric parameter
fade in = 2
fade out = 2
The number is the quantity of 1/10th seconds to choose, will be better step by step but for now 1/10 is fine.
Specify better the shake time
Shake screen actually allows to select the time of the crash, but will be highly better if you can select a time in steps or 1/10 like before.
Key pressed, key down and key release commands:
The title explains itself.
if key pressed = attack
score + 10
Key command allow to work with numerical keys
As the GameMaker's char command I think, allow the key command to use a number instead of a key, so you can work with any button.
Choose talk speed
Allow users to choose the talking speed for anything.
Allow to give speed to items, players, enemies etc.
Set the vspeed, and hspeed of anything to do some cool stuff with it. NOTE: The command SHOULD work with internal values, no high, low, medium, numbers and real numbers.
Allow negative and decimal values
Really, please!