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but for outdoor games i don't see terrain/water/folliage editor ?


Yeah, that's right. In fact, there isn't any terrain editor at the moment.
According to one of the developers a future version will have such an editor:
Quote:

The TerrainEditor will be available in the 1.6 release, planned for October 2007. It will allow to generate large terrains (from various sources), and to paint directly the height, the material blending and the vegetation.

(source)

And I've finally figured out how to move the camera: Hold down the middle mouse button and press W/Q to move forewards/backwards.