it seems to me you can nearly do everything with mouse only.
Moving, turning, actions... need to click the right buttons on the screen.
Even accessing windows is possible through mouse, not as fast as keyboard shortcuts but you can open them (i found my ingame guild forum with my mouse...)
For fighting actions, just double click your main attack, and keep your mouse clicker on the special attacks and click them when you want
So looks like keyboard is only here for shortcuts, and if keys are a shortcut, it means there's a regular way using your mouse to get everything you need.