I hope to see some day in Xara Designer the ability to set the offline of any stroke above path, center of path or below path.
Currently it is possible to do it with some kinds of strokes but not with all.
The best place for it would be in the Line Gallery, beside the cap options
This feature is important in Web design, following CSS behaviors where the strokes are not aligned to the middle of its path.
It is specially desirable with borders of images, now the stroke covers a part of the them since it is centered in their border instead of above.
Fireworks and Canvas have it.
This is a long time request, but I suggest it again after seen the achievements of version X9.