Hi Danny, maybe if just 1 planar face was selected, I could make an additional "Extrude" checkbox option that would show up in that case that would make it go straight like that.

Could be a little confusing because in some cases like boxes the result is the same between offset and extrusion, so there would be no difference when checking that option for cases like that.

But that could be a potential improvement to Inset.

- Michael