Hi. I just found this thread. I was looking for the same thing. Like shown in this picture from the help. I wanted my text to be in-line with the leaders. It looks like that's been answered, but does this mean that I need a separate dimension style for my ordinate dimensions if I don't want my regular dimensions to have the text rotated?
The solution below is from 2010...that switch does not control the ordinate dimensions in Inventor 2012
note: same dimstyle for linear and ordinate dims
If you don't want normal linear dimensions rotated, then you will need two different dimension styles. But you can set your Object Defaults style to default to the appropriate style for each dimension type.