configuration file and folder /etc/torrc + /etc/tor.d/
/etc/tor/torrc becomes /etc/torrc
new folder /etc/tor.d/
/etc/torrc comes with reasonable defaults (just the same file as /etc/tor/torrc currently does).
/etc/tor.d/ can be used by third party applications. For example a blogging software wouldn't need to ask the user to modify torrc or to somehow hack it, it could just drop a file inside /etc/tor.d/.
Or someone could make a package tor-flashproxy, which installs /etc/tor.d/flashproxy which makes the machine a flashproxy.
If you ever add new comments to torrc or new (default out commented) options, there is no conflict with other packages relying on torrc.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information