Thanks for the kind words (that the site is awesome).
As far as the technical hurdles, they are as follows:
1) ensure that users do not pull from the same feed twice
2) update the account interface so that it's possible to add a second
account without making it too complex
3) ensure that our system, which was designed to allow this, truly
works as we designed it
4) consider ways that this might be misused (intentionally or
otherwise) and do what we can to prevent it (we don't want to be bad
"neighbors" to other people's APIs)
So while the concept is straightforward, there is some work involved.
Still, we do agree with you that you should be able to do it. Stay
tuned.