Unfortunately neither you nor we can add TCMac to any list of identified developers. Only Apple can do that and they only do it for Applications purchased/downloaded from the App Store. You can, however, bypass this security function quite easily. Simply right-click (or ctrl+click if you don’t have a dual click mouse) and choose Open. 

You will still receive a warning that the application is from an unidentified developer but will have the opportunity to proceed anyway.