Hi!

Run this code and press space. It works for me (latest A8).
Code:
void main(){
	level_load("");
	
	while(1){
		
		mouse_range = 1000;
		if(key_space){
			mouse_range = 100;
		}
		
		DEBUG_VAR(mouse_range, 100);
		wait(1);
	}
}
If this doesn't work for you, I highly recommend you to start using A8 (at least free version) for multiple reasons. First of all, it's the latest version of Acknex. Secondly, forum is almost dead and users left here (most of them) a using latest version (I assume).

Best regards!

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