1. Only one; linking Template Virt VMware with the ESX or vCenter and adding the correct macros should be enough.
2. Debug logging only for VMware can be done as follows:

• • We can increase logging global by changing the log level in the zabbix server configuration.
  • We can do it more smart and only increase VMware logs by running:

zabbix_server -R log_level_increase="vmware collector"

3. Not out of the box; however, with LLD, it's probably possible to create your own implementation.