Graphicsmagick (http://www.graphicsmagick.org/) is a fork of imagemagick, that is smaller, faster and has more api stability. It also seems to have improved documentation (or at least it has examples and descriptions in the man file that imagemagick does not)
example performance chart:
it comes with a compatibility package to provide the imagemagick convert/mogrify etc commands but has dropped some of the imagemagick shortcuts like "-thumbnail"
to thumbnail on graphicsmagick you would do
gm convert -size 120x120 cockatoo.jpg -resize 120x120 +profile "*" thumbnail.jpg
the -thumbnail on imagemagick is a shortcut to "-resize 120x120 -strip". GraphicsMagick integrates the -strip with the profile option that already is there to manage image profiles
It is quite easy to add support for this. I made a quick patch for my system, however I would think it might be better to actually replace imagemagick with graphicsmagick (for the reasons listed above). If it was to be added as an option, would you prefer a new set of config options or to modify how the current ones are used? also would you prefer it was handled in a separate "if" block or merged with the current imagemagick support?
I vote for switching to graphicsmagick anyway.