I've added support for gridlines - which show you a line denotating
the indentation structure of the file you are editing. Its interesting
because what should just be a 'here it is' feature turns into a possible
feature with lots of sub-options.
I have added a 'set [no]gridlines' command as an interim to turn it
on/off, so I can become comfortable with what it shows me.
This is an alternative to the 'ruler' which is more 'in your face' in the
way the display is done.