You cannot do Batch conversion or convert multiple items with icomancer. About something called 'vertical compression' I don't know exactly what you mean mate.I've tried your link and although the icon is just like the image its size is big .Not sure you are happy with that.

As James stated, right now icomancer doesn't have a batch processor. Sorry for that.

On the other hand: I don't have the minor clue of why are you getting the images compressed. That's the first time someone mentions such problem.

Which version of Windows are you using?

What is being "compressed": images or icons?

Do you have any icon editor installed and associated to the shell so you dobule-click the icons and they open immediately on this editor?