True, but the streamer would have to manually go into G mode to do that. Then that would be on the streamer. What I am talking about is something built into the vanilla game that the streamer and team mates could use to their advantage to circumvent the intent of the game...an exploit most would call it. For instance, viewer uses some of his points to use slow command, enjoying the struggle the streamer has voluntarily subjected himself to by enabling the integration. Two seconds later the streamer used the fast command to cancel it out and goes on his merry way. Don't you think the viewer would feel a little cheated? I know another viewer could do the same thing but everyone would most likely already know there is a chance for that.
This is not a big fault really as I think like you said it would be just the bad apples. I don't even think many streamers would do that but I have seen one. I just thought it was something worth mentioning.