We didn't provide any customisation support even you have valid license, this is 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.

no, you already have this function, I just add random option in backend. it perform random in frontend.

Yes, you can add that random option from the image wall module to achieve this.