Independent scale in Compare Mode?

[tboy]

When 2 or more images are opened in Compare Window, scaling one will scale synchronous other images too.
This is not very useful if pictures have different DPI (one is small size another is big - for example).
Is it possible to have Independent scale for each image in Compare Mode?
While holding Alt key or something like this?
Reorder position of images in Compare mode and possibility to resize each image window size will be good options too.