Graphicmagic cant be used in all cases

As i see if i use graphicmagic, imagemagick will only call "gm convert" for all presets like watermark, but this cant be used in all cases cos graphicmagic have different commands and options like in case of watermark.

for example:

If i liked to combine two image i have to write this command for graphicmagic: gm composite input1.jpg input2.png output.jpg but imagemagick doesnt implement the imagecache presets for graphicmagic.

I dont know if i am on the right place but some module should implement these presets.