It would be useful to be able to use built-in macros to assign their value to user macros.

Example: the currently delivered templates "Template App Remote Zabbix server" and "Template App Remote Zabbix proxy". Both of them use the user macro {$ADDRESS} to access the corresponding Zabbix server. This might make sense in some cases, but in like 99% of all use cases for all those items (ok, it's in fact just three, but anyway) and without a need to change the template (by changing the macro used in the three master items) setting the user macro {$ADDRESS} to just {HOST.CONN} would be a good solution.