It would be nice to have multiple line types to choose from since Desktop and Pro line types always get downgraded upon publishing a map. (centerlines, phantom lines, lines with letters for different utility types)
The lines with arrows is good but they are very limited.
What would really improve the map would be the ability to choose a line with the direction arrow in the middle of the line (middle right, middle left) rather than at the end. This would be useful for people making maps that are showing pipe flow direction. When the arrowhead is at the end of the pipe it gets to jumbled up with the manhole and is hard to see.