Image variations JPEG quality

I'm using the 2014.11.1 ezpublish-kernel release and the liip-imagine-bundle that comes with this version. I noticed that without setting any image quality option all images variations are saved with 100% quality which leads to some very huge image files.

I tried the following settings:

1) Setting the jpeg quality in the ez image variations:

ezpublish:
    system:
        global:
            image_variations:
                my_variation:
                    quality: 60
                    jpeg_quality: 60

Doesn't work, error on clear:cache. Options unknown.

2) Setting the jpeg quality in the liip_imagine block (additionally to the setting above in "image_variations"):

liip_imagine:
    driver: imagick
    filter_sets:
        my_variation:
            quality: 70
            jpeg_quality: 70

Doesn't work, the 100% quality setting from the image_variations setting is used.

3) Setting the jpeg quality in the liip_image block only (the image variation MUST NOT be defined in the image_variation block):

liip_imagine:
    driver: imagick
    filter_sets:
        my_variation:
            quality: 70
            jpeg_quality: 70

This one works! I also found out that both settings (quality + jpeg_quality) are used, but I would prefer "jpeg_quality" since "quality" is deprecated.

It would be nice if the different quality settings could be used directly inside the image variations block.