Third only to how bad their search is and how bad they messed up @-mentions the easiest thing @SlackHQ could do to improve their product is make the channel title more useful. It's where we often answer FAQs but no one ever reads them because the UI doesn't incentivize it.
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That's an idea!
This isn't in the works right now, but we'll give it some thought. 
We're currently looking into making improvements to threads, including fixing the currently not-great files situation. We also have lots of plans for search. Anything specific you'd like to see there?For what it's worth, I see threads as a way of forking a discussion such that it doesn't clutter a primary channel, but being unable to localize attachments to a thread seems to run directly counter to that. I'm sure my use case isn't every use case, but I doubt I"m alone.