Well, here's a little example.
I have a pano where I'm missing some parts like blue sky

What I would like to do is fill those parts.
So I mark the parts to remove and the important features.

Then I do a "LqR + LqR back", using "auto size" (ie it will shrink the picture) and "vertical" only. I get this

Here's the resulting picture (with some transparency) with the original one behind, to check that the important features are left intact.

Here is the final image, ie the resulting picture with no transparency.
The problem is that some blending should be done to merge both pictures in a better way…Here I thought of cutting the picture in 2 and work only on the right part, because there's no important feature at the top of the right part.
Today I tried to work straight with the full picture, and instead of shrinking the pic, I enlarge it, still using the remove and feature layers. The problem I guess is that the building in the middle is too close from the top, thus there's not enough data on top of it. So after doing a LqR + LqR back, vertical only, the building is modified (or maybe there's a problem with the plugin, because sometimes it acts weird). Hum…now that I think of it, I don't really have to do a LqR back…
Well, I'll probably do some new experimentations…if you have any better idea on how to do it…
Hank