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PSA: Next MAME version will support new blendmodes in artwork files.
on the + side: the layered screen workaround isn't needed anymore (eg. oil panic)
on the - side: they won't be compatible with older versions of MAME.

The current .lay syntax is now legacy and will eventually be removed, maybe in a year or so.

*edit* details in cuavas's git commit: https://github.com/mamedev/mame/commit/c38a3395e94e38a37cf6b8efdf9f49a5c9d415df