Loop cut (ctrl+R) and space cuts in the same operation I am wondering if Blender has some hidden function or anything that can make even space between edges when adding new edge loops with ctrl+R. Or even space after adding them, like if it was a mirror effect of the selected edge, so that the other edge moves the oposite way if you know what I mean.

I made a GIF from 3ds max that shows the method I am looking for:



https://imgur.com/iDdWdEz

Figured out with help from Blender discord community that I can select my 2 edges and scale with Z, but this only works if the axises are perfectly alligned. What if I got something bent with different size like a cone, the vertices of the edges would not follow the edge with this method :(

Any ideas?
Use the Bevel operator after loop cutting.

Make a single loop cut were you want the symmetrically spaced loops to happen, then bevel with zero segments.

This will virtually replace the single centered loop with two evenly spaced loops. The advantage is it works well in non axis aligned faces, uneven loop widths and allows adding more loops.



Also see related How to slide a vertex group to make new edge loop? and How to outset from edges/vertices?