Flipped sprite optimization in SLADE

[Blastfrog]

It is known that the Doom engine does not adjust sprite offsets when flipping sprites, and the solution is to pad the narrower side with blank space.

I had requested a feature to automatically pad sprites in SLADE a few years ago and I just wanted to ask about it. Are there any plans to do the feature or has it already gotten in and I haven't found it?