"invisible" condlines for fine shading

[Max Murtazin]

While modifying some stuff about part 50898, I have encountered a bit of a problem. There was a situation that required to use condlines with all points being on the same plane. It it okay? Or maybe there are some ways to work around such problems? If not use that condline at all, software like LDView gives off a pretty bad picture in terms of shading with edges appearing sharp when they clearly should be not that way