In Cycles you can add nodes to lights like a spotlight and thus project light "gobos" like in the attached screenshot. This is a good feature to have for creative lighting and should be separated from the materials on the object themselves. I have attached a screenshot of how it works in Cycles wich I find good. I have also attached a file/.blend from wich this screenshot was taken.
Is this something that can be easily added ? On the roadmap? Never?
Texture support for point lights was already added to RPR, You can check this option in RPR 2.0.150. Thank you
Running blender add-on 2.5.17, what the op has asked for is still not possible in RPR from what I can tell, and especially with an animated texture. This is so easy in cycles and has been possible even in Blender Internal. Is there any way to accomplish this with RPR?