I like the idea of a desktop module that handles icons itself. I think it's long overdue. I have some suggestions, but since I'm not entirely certain how experienced you are with coding modules for LS, they may not be helpful.

I notice that you say it crashes when adding a !bang command. If you mean when you try to register your bang commands for your module, I'd suggest putting this on the back burner for a day or so and just creating a bang only module to make sure you've got the bang commands down solidly. Then you can just copy and paste the same code into this module. Whenever you have an error, it's best to try to isolate that error as much as possible, so you're dealing with ONLY that one error.

Another suggestion is for the label and text colour, and you may have already implemented this. You should be able to get the default label and text color for desktop icons, and i think that would be a good idea. But i really like the idea of being able to change it via the module.