Scaling Stroke Issue: On the menu bar at the far right, select the flyout and you will see the option "Adjust Stroke Weight When Scaling" here you can deselect to turn off
Resizing Issue: For just one image, select image, Object > Fitting > Frame Fitting Options > Turn on Autofit Desired Fitting Option
Resizing Issue: For multiple images, Object Styles > select stye(s) > Frame Fitting Options > Turn on Autofit and Desired Fitting Option