[Therion] Projected Elevation

I have a couple of caves (probably more) that could really do with a projected elevation, rather than extended. so I set off trying to do it. I started with one looking towards 90 degrees, but did not get any walls and the centreline was always projected looking north. Eventually found this http://mailman.speleo.sk/pipermail/therion/2009-January/002291.html Which indicates that in atlas this is all that is implemented. I assume it is the same for map? So I moved onto the cave that has a projection looking north. At least the centreline now looks right, but I am not getting any walls. Should I be, or is this not implemented either? Is the implementation of Elevation likely to happen, or should I start to look for another way? Andrew