SIGE - button plugin - right access

Hi.
With JCE, users can upload documents and pictures in a determinated subfolder, one for each user. When they click on SIGE button plugin, they can choose between the whole folders and subfolders. The only thing I can do is restrict the folder selection (e.g. images/users) but I cannot restrict per folder per user (e.g. images/users/a, images/users/b, images/users/c ...).
How to do that?
Or how to hide the button in Frontend?

Many thanks in advance for your help.
Best regards, AlainR

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