How to use multiple submit within a CTools Modal
Never figured out how to do this, but I worked around the problem by using CTools functionality. In a nutshell I used ctools_ajax_image_button in the table, specified a specific callback for the url and then alter the table with ajax_command_remove, ajax_command_restripe and finally returning it with ajax_render.

This is all based on the CTools AJAX example that deletes rows from a table.