In Heterocut and Neighbours puzzles, right-clicking makes an X appear between the dots.
While solving a puzzle, I find it quite difficult to tell what cells are in the same region, so I think having "connectors" instead of the X's (as in Seethrough puzzles) would simplify the solving process. What do you think?
I used to use the numbers you can put in Heterocut cells to indicate that cells with identical numbers belong to the same polyomino. This is much more intuitive, and doesn't require 'renumbering' after I find that two regions I assigned different numbers to actually belong to the same shape.