If a map element has all problems acknowledged and Zabbix has acknowledges enabled, a special highlighting must be applied to the icon. Possibly a green check sign or something like that. It should work only if a map has icon highlighting enabled.
Another map option should specify how to display information about problems. The following choices will be available: All, Separated and Unacknowledged only. Actually it should work as it is currently implemented in Dashboard (1.8.3).