I have just released version 2.3 of my ESXi-Customizer-PS script - a PowerCLI script to create customized ESXi installation images and the destined successor of my ESXi-Customizer tool.
I was somewhat in a hurry to get this out, because with the release of ESXi 5.5 Update 2 a bug in PowerCLI ImageBuilder manifested itself that needed a workaround. The new version implements this workaround, but also has one other improvement that you will like.