I'm not really familiar with the code behind Recently Active Threads, but it seems that what you're after could be a cross between Personal Nodelet (where you can add nodes to the nodelet) and Recently Active Threads.
I don't know how hard it would be to implement this. demerphq is the king of Recently Active Threads. But it seems like it ought to be, at least, possible. As they say, "patches welcome."
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