noscorch=1 would remove the bullethole decal (if there were any) but there is no current functionality for removing the material splash effect.
Would be a good feature to suggest if you can provide several examples of how optionally removing the effect with something like nosplash=x would be useful and worth their implementing it.
Ideally we should have something like what Plysmod had where a weapon can specify a decal effect to override with.
iterations = x controls the number of raycast instances per shot for things like shotguns, btw.
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