Many command-line options are from the NetBeans platform. See:
http://wiki.netbeans.org/FaqStartupParameters
In addition, a list of MPLAB® X IDE options may be found by using the
--help option. For example, on a 64-bit Windows® 7 system:
>C:\Program Files
(x86)\Microchip\MPLABX\vx.xx\mplab_platform\bin\mplab_ide --help