Would it be possible to get ‘built in’ barn doors? Directly in the light parameters(like in Maya). It would give you much more control over your light.
Hi, I had to google to find out what it is. 
Do you have any practical use for this?
In Corona you could play with the directionality parameter, change light shape, and/or use a custom texture for the light. Using a procedural texture should give you a lot of flexibility.
Another idea is to model the “shutters” manually.
Correct me if i’m wrong, but i think directionality in CoronaLights does exactly the same thing that barn doors on softboxes does. Only that Corona ones are infinitely long.
Oh, i overlooked “like in Maya” part :] I was refering to real world barn doors modifiers.
Yes, no actual I wasn’t precise with that. What I strongly prefer to the Maya-thing is a viewport-representation of the barndoors. It’ more haptic.
Then in Corona you can’t do it with a disc light using directionality only.
If symmetric: yes. But I need the barndoors when I want to ‘limit’ a light or in other words: need 2 directionality attributes in the light instead of one.
It’s also great to create ramps on the lit objects
Another idea is to model the “shutters” manually. 
Yes, I actually did that, but the drawback is: these helpers have the nasty habit of getting render/attributes they shouldn’t have and showing up in the render. Especially if you’re passing the scene over to another artist.
I’ll try to post some examples later on…
thanks for your contribution