Hi Gianluca,
We do not have such feature in the user profile and unfortunately we cannot accommodate your request currently as it is beyond our support scope's policy as outlined in http://stackideas.com/support

Having said that, if you require us to perform the customization for you, you can always request for a quote from us at https://crm.stackideas.com and select "Customizations" . Our sales person would be glad to send you a quote for the customizations that you have requested.