.B3D file format question

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jfk EO-11110

The .B3D file format allows to set most properties of a mesh, eg. Blendmode, Alpha etc.

But AFAIK it is not possible to override these settings in Blitz using "EntityAlpha m, 0.5" etc. Is there a way to alter these settings in Blitz? (without to recreate the entire mesh using CreateMesh etc.)

Is there a way to omit things like the Alpha Settings in the File Format, eg. by a value of -1 or something, to allow Blitz to set it at runtime?