Is there an easier way of threading Technic pins into other elements? I've been using Lego Digital Designer to recreate a few models I've built in real life. One model in particular uses many Technic axles which need to be inserted fully into other Technic bricks (like the [part:32014] shown in the image below).



(Click image for animation)

If Technic axles aren't inserted all the way, it causes more problems later on in the build, when the same group of parts are duplicated and used elsewhere.

In some cases, moving the camera angle around can help, but the axle continues to flicker around the screen as the axle is inserted.
As someone who also argues with LDD occasionally, have you tried using a placeholder technic beam to get two connectors at the right distance and then adding the axle into both connectors before deleting the placeholders?

If the placeholders are in a different colour from the rest of the model, you could use as many as you need and then delete them with the Colour Select tool, leaving just the parts behind.