If you are registered, you get access to the members only section, can participate in the buy & sell second hand forum and last but not least you can reserve your preferred username before someone else takes it.
If you mean can the accesorry rail be converted to a flash shoe the answer is yes.
You will need part 43125, the adjustable flash shoe, to make that happen.
This item is offered quite often at ebay around 15-25 euro.
I am not sure if it is still part of the current stock of the V system.