The Virtual Wireless menu allows you to create and modify virtual wireless interfaces for virtual wireless networks.

Interface - The wireless VIF (Virtual Interface) name
Enabled - Whether this VIF should be active and brought online
SSID - The wireless Service Set Identifier
Mode - Allows selection of Interface mode: Access Point, WDS, Wireless Client, etcetera
Bridge - Allows you to select which LAN bridge this VIF should be assigned

1. When creating/defining a new wireless VIF (Virtual interface), its MAC address will be shown (incorrectly) as '00:00:00:00:00:00', as it is unknown at that moment. It will display correctly as soon as the network is restarted and this menu is reloaded.
2. When saving changes, the MAC addresses of all defined non-primary wireless VIFs could sometimes be (already) set but might be recreated by the wl driver (Broadcom's proprietary wireless LAN driver). Thus, previously defined/saved settings might need to be updated/changed accordingly in the Advanced/MAC Address menu after saving settings and rebooting your router.
3. The Tomato web interface allows configuration of a maximum of 4 VIFs for each physical wireless interface available - up to 3 extra VIFs can be defined in addition to the primary VIF (on devices with multiple VIF capabilities).
4. Configuration settings for the primary VIF of any physical wireless interfaces shouldn't be adjusted in this menu. Use the Basic/Network page for that instead.