There should be a tool that quickly allows to edit the pipe slope and inverts and even be able to match elevations of various pipes coming into a structure. this tool should be similar to how you can edit and maniuplate feature line slopes and elevations. It should be able to apply to a single pipe or a line of pipes.
Also, The null node should behave more faithfully. Maybe once fittings get better incorporated into the the gravity line parts this won't be an issue, but you shouldnt have a null node that will strectch vertically, it should hold the pipe elevation to match center/crown/invert (as specified by user). Gravity lines have standard bend fittings too, not everythings a manhole.
Also, the Pipe Rules are not very intuitive or reliable. I am very good with software and i cannot make these rules work for me, in particular once the pipe network has been laid out. I should read posts on this, but just first pass as i've been able to test pipe network design, the apply rules hasn't been my friend.
Been on my wish list for a long time.
Editing pipes is a tedious mess!!
Thanks,
Conan Witzel