What is your favorite new feature in darktable?

@Pascal_Obry
Some aspects of the new modules Composite and Canvas enlargement have been discussed in the thread canvas enlargement colors aren't independent.

It’s been clarified that the canvas extension is limited to a maximum of 100 percent in one direction. This means that using the new module for creating diptychs (with images of same size, which is the most usual), it will not be possible to create diptychs with some space/frame between.

This make me wonder whether there is some coding aspect that “dictates” the 100 percent limit, or whether this limit is set somewhat more arbitrarily.
If the latter is the case, could one then rather increase the maximum limit somewhat (eg. 120) to facilitate a certain spacing?

I would also appreciate it if somebody could clarify where in the pixelpipe the two new modules are placed.