[Therion] How can I suppress white space around centerline stubs ?

[Michael Wasmund]

Hello,
For Fuchslabyrinth cave, we're using mainly morphed bitmaps.

With the standard thconfig settings, centerlines carry a "white channel"
along with them,
blanking out any bitmap content near the centerline (see attached image).

Is there a way to
a) define the centerline so that the white space around it is not generated
?
b) define centerline so that it is always drawn (e.g. not only the stubs) ?
c) define centerline so that it is never drawn (regardless of "point
station" definitions) ?

Regards,
Michael
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