Triggers:
-'Call trigger 'A' when somebody says text 'B'.'
Calls a trigger when somebody says the word(s) you entered in 'B'...
-'Call trigger 'A' when a movable is located in a random place in region 'B'.'
Calls a trigger when a movable comes/appears in a region.
-'Force character 'A' to press 'E'.'
The character presses E and can activate triggers or enter vehicles.
-'Make a gravitation field in region 'A''
You can walk over every (vertical) side of a wall (located in the region) (see image)
--> http://i.imgur.com/HsLhnJ3.png
Other idea:
-A cape, the fall speed will be slower with a cape.