what's the status here?

I'm combining this idea with Browsers, and other out-of-the-box reports, should have the capability of being classified​, as the ability to classify search terms would fulfill this idea as well.

Has anybody tried using the new "Hour of Day" dimension? Might be a little work in setting it up, but seems like it would work.

Yes we need a way to expire an eVar by more than one custom event. I want to use this for listvars so that I can measure impression/click events in a single listvar.

This one is huge. The main reason I'd say is that the current settings for the search keywords are rather lacking. Putting this in an eVar will open up many more options. It'd be nice to not have to do a hack to get this by using a processing rule (make the variable that captures this just like an eVar by default), or by using a VISTA rule or some JavaScript.

Would be great if Adobe introducted functionality in the admin console to add missing search engines

I agree that making this available in the Processing Rules feature is the best option.

Great idea.Probably Adobe could use that data to include search engines to the general list, if they are added by enough clients.