waveform~ display feature request

I am happily using waveform~ for display of non-audio data, and have
discovered it would be extremely helpful to have a mode in which only
the wave line is drawn, rather than having the curve filled in to the
origin.

I'm currently losing a lot of potentially significant visual information
due to the fill masking the data. Imagine a series of severe variable
DC offsets and a low-amplitude signal - the part of the signal between
the offset and the origin is completely obscured by the fill.

It's not critical since the data is unaffected, but it sure would be a
nice option... and since it's cosmetic and simple, I foolishly have my
hopes up for an incremental update. Any chance?

Thanks...