This took way longer to figure out that I would have liked, but oh well.
The Goal Setting certain client windows to appear in all tag selections. This is also referred to as "show on all workspaces".
The Solution I first tried to figure out how to specify that an application class should be associated with multiple tags, but I was never able to do so. I finally found an rc.lua file which contained the information I needed. I put this right after the "layouts" section:
stickyapps = { -- by class ["x-terminal-emulator"] = true -- by instance }
And this right after the "Check if the application should be floating" section:
-- Check if the application should be sticky if stickyapps[cls] or stickyapps[inst] then c.sticky = true end
UPDATE: Doh! This doesn't seem to work for the version of awesome in Debian's sid. :-(
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