Hi merlinuwe
Perhaps by starting from an "extended" template, with administration functions, you could make what you ask.
I posted this type of template today.
It will probably make other changes to suit the totality of your needs.
But you can look at what it is, it can perhaps be useful for you.
http://www.rejetto.com/forum/index.php/topic,8688.msg1050628.html#msg1050628Otherwise, Mars had posted on the forum in French a Exel script that allows to create users accounts in number.
http://www.rejetto.com/forum/index.php/topic,7951.msg1047946.html#msg1047946Maybe if Mars goes through here, he may help you more about this script.
As I see, there seems to be a lot of interest in this topic
This is not a lack of interest for this topic, I think ... that you ask is not really simple, and not done in a snap.