Comment 15 for bug 196135

And why don't use "update-alternatives" methood.
So /etc/timidity/timidity.cfg may be just a link pointing to /etc/alternatives/timidity.cfg.

And then user will be free to choice by doing:
sudo update-alternatives --config timidity.cfg

I think it's more Debian/Ubuntu standard, and it's used for a lot of packages with successfull results..
And it will more easy for new users than manually edit links or configure files.