This is a program to simplify the ability of modding pedestrian personalities in GTAIV. It allows you to modify any number of attributes from age to sexiness.
The flags editor allows for some advanced attribute editing. With the flags you can specifiy anything from what kind of vehicle the ped drives to how they act in certain situations. In my testing experiences, the flags are just for reference. For example, if you select the model name "F_Y_Hooker_##" and tick the "+policeofficer" sub flag, it doesn't make hookers chase after you in police cars when you have a wanted level.
You will need the Microsoft .NET Framework v3.5 installed in order for this program to run at all.