I am using Image Manager Extended but I have some issues with the upload and resize features.
The problem is that the resized images are still quite big in terms of Kb. For example if I resize an image externally with 60% quality at 72dpi, this is usually less than half of the same image resized in JCE.
It also happens that I resize an image and the result is still bigger (in term of Kb) than the original image.
I do see an option to set the quality for the optional thumbnails, but not for the resized image, is this something you are planning to add in the near future?