I never, ever use column selection or typing, so perhaps the following behavior is useful there.

Frequently I have a block of code I need to indent. Say my Ruby code looks like this:

class Foo def bar puts "yay" end end

I lazily select parts of the lines I want, (because it's faster than being sure to select the entire line) represented by the | in the following showing the start and end of the selection:

class Foo de|f bar puts "yay" en|d end

When I press cmd-], I expect:

class Foo def bar puts "yay" end end

(which is what BBEdit gives me), but what I get is:

class Foo de f bar puts "yay" end end

...where's the logic in that? If I have no text selected, but the carat is in the middle of the line, cmd-] shifts the whole line (as desired). I suggest that the 'break-the-line' method only occur if the selection is columnar - i.e. if the start column of later lines is the same as the start column of the first line.