eikonoklastesalexeyvanzhula1984That's a good point. Having all reference images in the perspective view, and not have them interfere with view navigation is a reasonable thing to want. I'll RFE for it.
He probably means that during navigation with alt+lmb, I accidentally click on an object with a blueprint that interacts with viewport pivot, and the camera doesn't rotate as needed. The issue is likely not with navigation, but with the fact that background images aren't suitable for my type of navigation. Houdini background images can't be displayed in the perspective viewport all at once. This is important to me because I'm used to aligning the camera with the shift key, like in ZBrush, instead of toggling between orthographic projections.
You can set the refs images in the perspective view if you use a textureuv node with cams projection option x example , to proyect uvs on a grid , and loading a the ref image with a labs quick material node( better node than atributte from map , because you dont have to subdivide the grid to see the image details.
There are many ways to loads images in perspective view to setup references.
If you want you can create a houdini digital asset , to do it fast.