Sorry to bump. I have been playing with this in my homebrew build and I don't encounter any issues.
As I said, I've made this feature only for one specific use case (only, and ONLY opaque colourized blood decals from P_TraceBleed - no generic translation feature, no other customizability)... so it is possible that I'm being extremely shortsighted, which is why I need to be told if anything needs to be changed or not.
I have a big pending update to
Nash's Gore Mod, besides several bug fixes and new features to the mod, I'd like to unify the look between the wall decals and the floor splat actors, and it would be great if GZDoom 4.3.4 has this feature so that I can release my mod with the updated visuals.