Rhythmic expressions and bar repeats in ChordNames

[Louis Guillaume]

Hi - I have 2 somewhat related questions here dealing with ChordNames:

1. How would one add rhythmic expressions (such as slashes)

For example - in 4/4 I want a:m7 for 6 beats then e:7 for 2 beats, so 
the ChordNames look like:

   | A-7    | / / E7  |


2. If I "\set ChordChanges = ##f" can the repeated chord symbol be a
   bar-repeat sign instead of a repeated chord symbol? At least if it's
   on the same line?

I've tried doing

        \repeat percent 2 a:m7

but it just omits the chord symbol in that case.



Any help would be great!

--
Louis