Based off the quick look of the level 20 dungeons (Which, let's be honest, are easy as fuck. Walk here, walk there, click here, done.), it's easy as fuck to script, just look into the C# code, you probably could make a working script in a couple of hours.
But, I said WORKING SCRIPT, not working leveling. The script would logically work, but, the bot/mesh would probably fail somewhere.