I use an XBox controller while playing it on the PC so the controls are the same for me. But in general they just use an analogous control method for keyboard and mouse. You'd either have to tap A/D repeatedly, or right-click/left-click. But it doesn't seem like a game that lends itself well to mouse and keyboard. I wouldn't want to constantly see a mouse all over my beautiful South Park screen

And there's actually a lot of kids that don't talk to me. The ones sitting in the basketball park on their cell phones don't talk to you. There's also a random one on a bench in front of the bank or the post office or something that doesn't talk to you. So the girl on the cell phone I just assumed was like one of those. Unless all those characters are glitched for me. But they make random comments when I pass by sometimes. I just can't really talk to them. Only thing different about the cell phone girl is you can hit the A button on her. But I wasn't too bothered by her not replying