Rescaling of replaced slides

Can I prevent the rescaling of slides, if I replace them with another image?
My current workaround is to copy the animation before the replacement and past it afterwards. Another option is to make the slide a placeholder and replace the image than. But is there any global option to change this behavior?

Today I discovered that it is possible to prevent the rescaling upon replacement by changing the slides to placeolders and back. This way FM uses the placeholder settings if you replace an image, which can be set to “Do Nothing” or “Fill Layer Completely” (default).

So just press the following shortcuts to change this on all your slides:
cmd+a (select all)
ctrl+shift+p (set slide to placeholder)
ctrl+shift+p (set slide back to normal)