Can you add a function so that the enemy doesn't just stand still, but you can set a specific direction for its movement? For example, to patrol? 

The other thing is... 

I would be grateful if you could implement a "rain" function in the editor! 

Custom guard movement or patrolling might be coming in a later update, but it won't be for a while.
Rain can kind of be done already by making a decoration with an FSM that spawns particles.
Or you could do screenspace particles with HUD/foreground0.png to HUD/foreground3.png