Yet Another VLAN Tagging Post

I have CenturyLink fiber directly into my house and I see that VLAN Tagging on the WAN port supposedly used to be a feature? However, it appears to not be available on the current firmware. Any chance that makes a comeback? Would really like to get rid of my C2100T and not have to buy a managed switch. 

I'm currently using the ORBI in AP mode but I feel like I'm not really getting the full benefit of the device just using it as a fancy WAP. Would be nice to take advantage of the router features as well. Is there an ETA on this?

I could buy a smart switch but I'd rather not be out another $40.