User modification, add user to security group

User modification, add user to security group

Hi,

I want to achive a simple, but extemely effective task. Using "User Modification"; i would like to have a drop down (or radio button) selector. Each selected option should make user a member of a specific security group. Same logic for removal.

I want to create a simple way for our Help Desk to remove and add permissions (based on security groups), but I cannot seem to find any way to do this. 
I managed to do this is in a very cumbersome way when creating a new user though. 

Please advice if you have any suggestions on how to achieve this. We have a pretty convoluted name standard, and it's easy for them to select the wrong group (if they can find it...)

BONUS QUESTION! Why isn't it possible to just add a "text box" with instructions to user?

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