I know this question has been asked a number of times, but my search returned a few posts that were quite outdated, so I thought I'd ask myself. As I see, the only possibilities are retextureing\skinning and adding clans. However, what about dialog, scripting, quests, design... And also what tools can be used for modding the game? I know it's built on the Source engine, so I expect Hammer to be an option, but as I'm not really sure, I'd really like to know what you, people, do.
Tanx in advance!