I often want to pixel peep more than 100%, something that I noticed that PF didn’t have right off the bat, but didn’t request it because it was a minor quibble. I don’t need interpolation, just bigger pixels. 
PS Zooming is particularly useful when I am using the defringe tool. I have trouble seeing and adjusting it without a huge zoom, often having to turn to RT (which is not a bad thing 
) or exporting the image for examination in G’MIC.
PPS 
Looks like something is wrong with the defringe tool. I exported 2 images, one without and the other with defringe. When I take the difference between the two, I get this. PFI: 20180603_140157.pfi (17.7 KB). Raw from [Play Raw] Peaceful mountain view.
PhotoFlow: left without defringe; right with it differenced and equalized (boosted).
RawTherapee: left without defringe; right with it differenced and equalized (no boost).
Looks like the defringing is only occurring in the brightest regions and not even the edges.
PhotoFlow: left without defringe; right with it differenced and equalized (boosted).
