Heya! I’m loving that AMIGA lamp! Also Silkwork was such a great precursor to S.W.IV (Silkworm IV).
You can control that via SHADER PARAMETERS, SCREEN BLACK EDGE section, BLACK EDGE THICKNESS. That was way bigger on real hardware!!!
Yup I did a test, then went on with my own implementation of Aperture Grille for soon to be released Sony Trinitrons. Probably at some point I will include a somewhat “blank” preset for people to freely reference other shaders, but for now is more of a hacky linking, also considering preset pathnames tend to change frequently.