I will try to make it clearer:
If I remember it correctly - In your previous version I had the repair option without the change.
The problem is not the change, but when choosing change --> then next --> you get "Modify, Repair or remove installation" window.
If you choose modify and you have only one feature in your setup, or you do not want to allow such changes, it looks a bit funny.
You can test it yourself with your own installation (AI v1.7).
I think that if you will add an option not to have a modify option - you may have the repair by default.
Regards,
Avi