Don't see why not, the plan is to let effects take place either after the scene is rendered, after the hud is rendered or after the ui is rendered. Which should be changable in the shader itself.
Also, just a small update on the new tags, I can now read shaders from map caches' and apply them. Still got to get extra bitmaps working though. Some shaders will still be external so that they can be tested and applied globally.
I've currently got two tags for post processing, shader_post_process and shader_post_process_collection. The first is where the shader code is and where your variables are defined, with the second referencing the first and having the effect definitions.
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