Andrew tells me the reason why ladder blocks don't cut the lining is that the ladder block goes through to the stud yet the lining should only be cut at the junction. However, in real life that is how it is, so we have added it to the development list (Just so you know there are 650 items on that list so It won't be in the next release, unfortunately, FYI we prioritise by the number of times an item gets requested).
An interesting bit of trivia. Did you know that when you export your Sketchup model to Layout, the junction will auto-dimension? All you need to do is tick the "Autodimension page" check box
Another trip: if it's a busy job with multiple walls close to each other, the dimension string will be very cluttered. You can turn these dimension strings off in the layers inside the Layout tray. I hope that helps. .