Is there a way to open a text file and load all the ed2k links from the file?
Yes, there is. Just place all the ed2k links you want to download in a text file, each ed2k link in a separate line. Name that file ED2KLinks then place it in ~/.aMule and aMule will automatically detect it, add all those ed2k links to download and remove the file. You might want to read this to know more about this file.