Wyse 3040 8.6 - bypass mapdisks=no with MTP device

Hello,

In our company we use RDP session and we have lock usb key with "mapdisks=no".

On the Wyse 3040 8.6 if I plug an android smartphone which use MTP protocol I can easly read/write on it.

Is there a new parameter to disable access of MTP device or it's a security issue ?

Thanks for more informations on this problem.