correct, for the 240 guys you guys get a bolt on twin caliper setup that you can do, if you do it this way you wont have to touch your current brake lines and wont have any issues with it when you pull the brake. If you pull the handbrake and push the brakes at the same time it will most likely push the extra fluid to the brakes and when you let off the hydro it will be pushing fluid back causing all the brakes to lock up.
I have mine in line because thats the only option I can do and the pedal feed back isnt that great because of it.