You would need a cheat engine to edit the numbers.
For the part of using the Night Vision Cameras, you have to do that on the DESK SETUP menu. The Night Vision Camera basicly makes the cams more brighter when enabled, while when they disabled, its standard darker. Its specialy good if you wanna see Frenni more clearly when shes dancing in the backstage, but also to see cearly around the areas with the cams.
Also the cams will have a green light coming out from them when enabled, so there is some detail to it too.