[Therion] One sided floor-meander?

[Benedikt Hallinger]

Hi there,
i currently draw a very narrow floor meander that has some places where the 
walls spread wide open.

Is there a way i can tell line:floor-meander to render on just one side?
The reason i ask is, that i need a differentiation in the dataset between 
floor-meander and floor-step for colouring and scientific reporting reasons.

With best regards,
Beni