I'm working on a bot that will gather all data, including revision IDs, as they are made available via the MediaWiki API, by polling list=recentchanges. To make it easier, I'm developing core patches to make more data available via the API. See, e.g., bug 68950, "log_params should contain the revision IDs of null revisions created by page move events". I don't know why anyone else but me, or someone working on a similar project, would need this feature, but being able to access that data via log_params makes it so I don't have to do a separate prop=revisions query.
I was wondering, how do the +2's decide what API features are useful enough to enough people to be worth reviewing and merging? Are they more likely to ask "why" or "why not" when a new API feature is proposed? Are there any developers in particular who'd be interested in reviewing new API features for obscure use cases? Thanks.