I've done scrolls in royal, IMBC, or regular BC with no problem.
You could also try the tilting turntable from Wilton. I have one and only just tried it last weekend for the first time, and I really liked it, but you would want to be careful how you put the cake on it, so it can't slide off, because I've heard people hate that turntable for that reason.
For all the scroll cakes in my pics, I did piped them by sitting in front of the cake, without it tilted. I've always used the Wilton presses to start my scrolls and embellished them from there. I just sit down and pipe with a #2-4 size tip with a steady hand. Oh, and I always use a wrist brace because my hand shakes if I don't. You want to make sure you're not going to fast, or the icing will break, and not too slow or it will look unsteady. It's sort of a "feel" thing.
For any scrolls that I don't use the presses, I just take a tooth pick and lightly trace the imprint of where I want the design to be, then pipe over that as a guide.
Hope that helps.