Não recebi muita ajuda aqui, por isso perguntei isto noutro fórum e recebi esta resposta:
You could, I suppose, experiment with converting the image to use Smart Filters.
Look in the Filter menu near the top. Not sure whether the other implications
of doing that are acceptable to you. I haven't done this much myself, but I do
know that it works on an image layer, so it may not suit your needs -
I understand what you want is something like Lighting Effects as
an adjustment layer.
Regarding the dialog size, it appears to be a relatively old filter, and
there's no way to change the dialog or preview size for it, nor any zoom
capabilities. Changing a filter to use an updated interface - e.g., one with
a resizeable dialog and full zoom capability like Lens Correction - is not a
trivial task (I know this because I've implemented such a framework for my
own plug-ins).
-Noel