Multiple File Selection not working

I would like to have multiple file selection for an image field.
It does work with the module "IMCE for FileField" with a file field.
But it doesn't work with IMCE with an image field. When several files are selected and "Insert file" is clicked, the error message is "Please select a file.". This comes from the file imce.js line 546
if (imce.selcount != 1) return imce.setMessage(Drupal.t('[546] Please select a file.'), 'error');
selcount is restricted to 1 file

Could someone help me to modify the code to allow multiplefile selection ?