Midi Mappable Sample Editor Controls

I love the possibilitry to preview the sample from the selected position with ENTER key. But how about making this one, stop and transpose buttons in sample editor midi mappable? It would be great for previewing samples from midi keyboard.

If not, at least make it possible to assign a keyboard shortcuts to transpose buttons too. I often preview samples at various pitches (I’m a hiphop producer), so this would be incredibly handy.