I don't think it would be very practical. There is a fine balance that has to be maintained of players playing their own characters for their own benefit, and then simply helping others. The problem some have is that they log on and there may not be anyone available to help. I can see how that would become a bit of a problem.
One idea I had been throwing around in my head was to potentially have some sort of an adoption process. Players would have to opt in (not be required) to the program and pledge one or two nights of playing per week to help out there "adopted" new member. Of course, once that new member was comfortable the two could decide when to drop the regular help and move on.
It could always be tweaked, too. Just an idea.