I stumbled uppon this in the following way: I have a assembly > in this assembly i have a section view > in this section view i created a callout > and in this callout view i created a filled region. While creating the filled region, i'm not able to trim/extend or align the lines. I have to move manually the lines and hope it to snap, so it should be very helpful to let us use these much needed tools.
The picture below is to show the grayed out tools.
