Hi Gary, as this is a linear dimension I think this ability is limited- a quick test found a display option (on the right click menu) for Offset text, where you can change the position to make it look like the DIA- see below. You would have to apply this on a case by case basis though rather than having this as a document preference/template setting. I cannot find anything else that comes close I'm afraid.
Thanks Adam... I thought that SW was treating it as a linear dimension - thanks for verifying that. It's a pity that it isn't a dimension type of its own. The offset text thing is an option I suppose but not great to have to manually move it in line with the dimension arrows. Also, if one changes the geometry driving the dimension, when the drawing updates it will probably no longer be in line and just wouldn't look neat.
Anyway, thanks for trying