as a general rule of thumb
boolProp testingCheatsEnabled true uses a great deal of system resources, the downside to this that leaving it on during a save or game exit can lead to data corruption because of the excessive demands on system resources. This is just a general rule of thumb, not some kind of sacred law. If you need to use the testing cheats, then I recommend you use MikeInside's method to add a special "shortcut" to quickly enable and disable most of the cheats:
http://mikeinside.modthesims2.com/hacks/cheats.htmlOf the ones he lists, the only one I strongly recommend you do not use is the "party" cheat - that will doom your system to a slow, horrible death in almost every instance.