Regarding flip normal i cannot find a way to make the face selection change color when flipping normal this would be handy since exporting to unity often lead to flip normal and in blender when you flip normal you have no visual cue when you flip them.
So to troubleshoot bad geometry or to find out which face have flip normals is very difficult.
Maybe there is a way but so far i found nothing in the 3d view theme color for flip normal.
Yes i know we can show normal in viewport but if you ever work in other 3d app like 3ds max when you flip a normal you have an instant visual cue that tell you they are flip with a darker shade without having to activate normal blue line display mode.
I was just wondering if there was a kind of equivalent to this in blender.
Technically it is a visual cue on face flipping when you are using back face culling, if you can see through the face then you know it flipped the wrong way, you just have to press z to toggle display of your mesh. This was something that was missing from Blender for a while and I’m glad it is here now. I know what you are saying about the presentation of selection color though, and there is when using back face culling. When a face is facing away from you there is no internal coloration of the polygon, when you flip it back towards you there is.