@ UnNeurone
How about a "Remove object/objects without resize" checkbox near the "Select new width and height" option that disables the width and height options.
Areas that need to be preserved could be masked as usual with the feature preservation mask.Then, using the feature discard mask the photo is scaled down just enough to remove the entire area in the discard masked, no more, no less. The scaling should be horizontal, vertical or both depending on what would be more efficient (least amount of seams removed) and do not affect items that are masked to preserve. When the down scaling and object removal is done, a rescale back to the original size is then done utilizing the feature preservation mask to prevent distorting important areas of the image.
Additionally, you could add the option to restrict scaling to horizontal, vertical or both using radio buttons below the checkbox.
This might take longer to process that a regular liquid rescale, but the only real challenge I can see in doing this would be determining what the optimal method of removing seems would be before rescaling back to the original size. Be it horizontal, vertical or both. I guess one way would be to determine the number of seems removed using each method and then compare. The option that removes the least number of seams wins. Unfortunately that would probably involve processing the image multiple times to determine which method is best.