Feature line interaction with other feature lines

[Anonymous]

When editing feature line A (single line, not from corridors), I've found
that when a vertice of feature line B touches line A, a new vertice at that
point is added in the elevation editor box of line A. Then, if an elevation
of line A changes, the vertice caused by line B governs at that point. Is
this meant to be? Can this be dynamic in nature?

The only way I've found around this is to not have feature lines touching on
the same site.

Also, what is the reasoning for not being able to grip edit a feature line?
e.g. dragging a grip to a new elevation?

Thanks,

Darron