Andrew,

Usually I point to something to start with.
Sometimes I want to point away from here but then the arrow is where I just clicked.

An option on creation would be nice.
The capability to reverse the Leader orientation afterwards is another method to get it pointing the intended way.

A Leader entity is stored similar as a polyline.
I think it would not be difficult to reverse the basic polyline and update the dimension shape accordingly.

Regards,
CVH