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Hey philippvavra,

Unfortunately it would require quite some time and customization to modify the default feature of the wordpress. so I am sorry to tell you that this is not covered by our support. However if its really important for you to get this done, you can always hire a freelancer to do the job for you :)

However there may be some plugins in the wordpress directory which will allow you to do this easily. Please check for author plugins in wordpress director that may support similar features.

Best regards,
Vinay