How can you setup skills for example shift +right click? I noticed in the initial Tera intro level 20 event, that if I moused over the action bar for the mouse clicks, it showed a shift skill as well as just the click.

I would start here. I go over the shortcut keys and later on the series the UI Customization.

http://www.youtube.com/watch?v=cN5uoeKJ0NM&list=PL93CBBCEA95697399&index=1&feature=plpp_video



Kind Regards,
Lancer Eziel