I'll copy/paste the important bits here.
Skewing wall textures is tied to aligning the textures with the floor or ceiling of a sloped sector.
It would be nice to be able to skew the texture even if the floor/ceiling is horizontal.
Consider the following example. On the left is a skewed texture matching the floor very nicely. However, as such things sometimes are in real life (e.g. the lines painted on the wall for patients to follow in my local hospital), a sloped wall appearance matching the overall slope of the stairs on the right might also be desirable, even though the floors/ceiling are horizontal (though, perhaps big chunky stone blocks wasn't the best texture choice here).
There are plenty of other situations where a mapper might want to skew a texture too.
So, I was wondering if something like, say, some custom fields for the upper/mid/lower/back/front of a line could be added where a mapper could enter the angle by which they want to skew a texture, independent of floor/ceiling gradient?
The feature is great as-is, but this would be a useful enhancement IMO.
I love it!
