Hi there !
There is an ongoing discussion at http://drupal.org/node/1510532 on whether SCOTCH should allow forms to be arranged in layouts.
To sum up, this has begun because we now want the node form to be a 2 columns layout. While discussing this, we realized that SCOTCH could eventually be used to put form parts into layouts, instead of some custom form API / markup / CSS tricks.
Having this possibility would be really nice, forms could benefit from layouts in a lot of places, not only the node form.
What do you think ?