No-no, dynamic drops aren’t solid textures in my case, on the video above the texture is generated at run-time. I’ve seen a lot of those lately, read many papers and if you want good looking rainy effect you need to actually generate droplet objects and simulate them (there are several ways to do it).
By panning textures you can’t achieve the behavior of the real drops (although a sprite sheet will probably look better but even in case there’s no interaction between the objects). I have panning since day 1, if you look at the very first video there is distortion effect which is done with the same material and it uses uv shifting, but its capabilities are limited.