A couple questions

I have a couple of question that I wasn't able to find the answers to anywhere else. I like to add custom context menu ectensions for a lot things Eraser related.

1. What command line switches do I use to enable Eraser to use a custom erase method, one that has not been supplied as an Eraser default?

2. What command line switch would I use to get Eraser to prompt me before execution?