Those two need a corresponding location entity.
I'll probably make variants at some stage which take coordinates instead.
with that, move should be self explanatory.
With wander, the "Radius" field defines the radius of the circle around the location entity in which the entity will wander.
Also note that the player can use these too, but ONLY during cutscenes.
EDIT
As for question #2, have a look at marystorm, or rosestorm as mike renamed it. Specifically the prison door and the piper's scripts.
You can define any arbitrary signal, there's a reason the syntax is "r_script_signal str body" and not "r_script_str body."
You can call any arbitrary signal and define its parameters. The internals use this exact same method for calling "update" and what not.