I don't understand: were these desired effects you mentioned working, and now you can't get them working? Or, are you trying to make them, and that is where you are having trouble?
I'll assume the latter (i.e. you're trying to do this and you're having difficulty).
Well, um, yeah, I can't see why you couldn't do any of this. Using a terminal to repair items -- definitely. Doing the haircut thing: I don't know, as I have never meddled with the haircut feature, but I would imagine so. Opening a store... That, at least to me, is more complicated, philosophically and technically, haha. But, yea, in essence, I could see that working too.
And, as for making this, I would suggest writing a script up for the terminal itself, rather doing all this via a quest, if that's what you meant, :S. Actually, using the dialogue for the terminal is cool too... I can't remember off the top of my head.
Okay, so it seems I'm just rambling uselessly. Could I bug you to be more specific? That is, do you want help/ideas on how to make these things happen via a terminal? Or...?