Suppose I am working in slide QRS, and I need to resize many images at a time (let's say A, B and C). A and B also appear in slide XYZ, and C does not. That means that if I want to resize A, B and C in all the slides (QRS and XYZ), I have two options:

1) resize A, B and C images one by one, using designer mode, in slide QRS, and then resize A and B one by one in slide XYZ...

2) resize A,B and C together in slide QRS, then check the size of A and B, go to slide XYZ and apply the same size to A and B.

3) resize A,B and C together in slide QRS, and then copy paste the resized A and B images in slide XYZ.

Now imagine I have to do this for many images and in many slides:

Option 1 and 2 are impractical. Option 3 is very impractical if there are animations and interactions that do not necessarily occur in all slides.

Solution: add an option to designer mode where I can resize by percentage. (30.2% smaller, 40.6% bigger, etc). This way, I can resize them as a group or individually in all slides, according to my needs, with high precision.