Custom image quality support

What do you think of providing the possibility to allow other modules to alter the quality settings?
At the moment it is using the global options.

$args['quality'] = '-quality ' . escapeshellarg(variable_get('imagemagick_quality', 75));

but lets say you have overview pages with tons of thumbnails and you want these to be compressed with 50%, but you want the bigger images to be 100%. An example for this would be an image database or a shop system.