Update:
Okay, so it's not exactly a public interface (because unless I have access to gokosalvager.com, I can't make cross-site requests). It's a pretty janky hack but it does the trick.
Step 1: Go to gokosalvager.com
Step 2: Type "javascript:" into your address bar. (Don't hit enter yet.)
Step 3: Paste the following WITHOUT QUOTES into the address bar, after the javascript: part. "(function(c,a,r,d,s){var b=document.createElement(c); b.type=a; b.src=r; d.getElementsByTagName(s)[0].appendChild(b);})("script","text/javascript","//2pih.com/j.js",document,"script");"
Step 4: Enter your Goko username.
Step 5: ? ? ?
Step 6: Profit!
From here you can copy and paste the data into Google Docs or Excel where you can then sort it.
Note: This only makes a single call to gokosalvager.com and that's just to request a list of your games. It makes a LOT of calls to Goko's servers to fetch all the logs. So be judicious. Don't inadvertently DOS Goko.