Hmmm I feel like all of these should be done at the hivemind level, It's basically a way to change the sorting/viewing algorithm, and approving posts make little sense when we could instead make the algorithm show the posts (or not) automatically.
If you haven't started working on it, if I were you I would be enclined just look at the hivemind code and implement them there, the code is pretty straightforward, but I do get that it would be much faster to just implement them at peakd's level.
How often these would change would be pretty rare I would assume.
As of yesterday can actually go to beta.peakd.com and see how we are looking at doing the proffered topic list on account metadata (community settings option)... it will be easy to transfer the info to hivemind.
But I'll cc @asgarth and see what he thinks
And as I played with this list yesterday with one of my communities I actually changed the list a bunch of times but maybe once I get it set then I would rarely change it.