Most other systems supporting bank feeds use Yodlee. We only intend to support the largest banks for now using the Chrome plugin, other developers however can actually add to this plugin (as was the case here for RBS).
We don’t want to go down the Yodlee route right now as it’s far from reliable and we’d have to charge this out to users to cover the 25k p.a. licence fee. I actually discussed this with another user a few weeks ago.
http://community.quickfile.co.uk/t/hsbc-auto-imports-yodlee/1330