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\$\begingroup\$At the very least the top tag (like in the page title) would be helpful. Furthermore, there are RSS readers that can parse extended data and do interesting things with it, so having it implemented in proper <item><category> tags (RSS) or <entry><category> tags (Atom) would be ideal.\$\endgroup\$
\$\begingroup\$I was about to say "This might be better at Meta.SO, actually," then I went looking to see if it was already proposed. Instead I found strong indication that new RSS/Atom features are not being considered. Digging into Stack2RSS (from that link), it looks like the Stack API simply doesn't expose a question's tags, making it unlikely to be an easily-implemented feature. Sadface. :(\$\endgroup\$
<item><category>
tags (RSS) or<entry><category>
tags (Atom) would be ideal. \$\endgroup\$