Currently the only setting you can change is the accuracy level of the voice control interface. The default accuracy level is High with the other choices being Medium and Low. Why would you want less accuracy, which increases the chance your robot will misunderstand what you say?
In a word, speed.
If you have an old computer system, you may find a noticeable delay of anywhere from 2 to 5 seconds or longer, depending on the speed and memory of your computer. This really takes the fun out of the voice control interface.
If you are having this problem, try the Medium setting first. If your system is still slow, then resort to the Low setting.