Hey @ZStructural welcome to the community!
Feel free to Introduce yourself 
if you’d like.
The ETABS connector is still in its early days, but we’re actively working to support and improve the Rvit<>ETABS workflow properly.
I believe walls and floors should be supported and we’ll investigate to see what’s up cc @connor . In the meantime, you should be able to receive them as meshes from ETABS’s Connector receive settings.
In regards to “mapping properties”, this is a bit more complicated. Which ones did you have in mind? What’s the workflow you’re trying to achieve?