It would be nice if the local axis was drawn in a similar manner to the orientation indicator at the bottom left of the 3D Layout window. When I want to share local coordinate systems with my mechanical team, I usually have to save an image of the 3D layout and add my own arrows at each surface to provide more visibility.

Also, the Y-axis indicator gets lost when on a flat surface viewed in the Y-Z orientation.

Finally, separating the scaling of local axis arrows and fletch arrows would be great. It was mentioned years ago in this thread. 

Highly tilted systems with lots of off-axis mirrors would greatly benefit from an update to this feature. 

Where is the Y axis? Which surface is the axis located?

Much better