Currently the plugin does not specifically handle the the ASA subtype. If you want to try a bit of a hack, do this:
Find your awning in the Vera Devices tab and click the ">"
In the advanced tab modify the altid from WC/RFY0/?

?/?? to WC/RFY3/?

?/?? (don't change the ? characters)
When you hit "Enter" the change will be saved
In the Vera Apps -> Develop Apps -> Luup files page download the L_RFXtrx.lua file
Save an unmodified copy of this file in case this hack doesn't work
Edit the file:
Find the three instances of this line: elseif ((string.len(id) == 16) and (string.sub(id, 1,

== "WC/RFY0/"))
Modify it to look like this: elseif ((string.len(id) == 16) and (string.sub(id, 1, 6) == "WC/RFY"))
Upload the modified file to Vera
Vera will reload luup
You may have to refresh your browser
Try it out. It it doesn't work, upload the unmodified L_RFXtrx.lua file and undo the changes to the altid of your awning.
I'm working on a redesign of the code that handles the creation of messages transmitted to the transceiver. The goal is to make adding new devices and subtypes much easier. This is turning out to be a pretty big change. It going to take a fair amount of work and time.