My idea is:
It would be useful to enter the e-mail language and country of the contact in the “Quick Adds” screen
For marketing in the immediate vicinity, it would be useful to calculate the distance to the contact as a function of the geo-coordinates
In some countries, the holidays take place on different dates depending on the federal state. A federal state field depending on the postcode would be useful
In order not to lose the good reputation with the e-mail provider, an option for a very slow and randomised e-mail dispatch would be useful
thanks
Klaus