I am not sure about this idea.

I think there should be a section where important news and events can be shared so the whole community can be properly informed. But this doesn't necessarily needs to be the default feed. So perhaps changing the default feed when we visit the site can be a good solution.

searching by multiple tags

I think this is a great idea, and this could be expanded to things like autovotes. Like for example, setting up an autovote when a certain user uses a certain tag. This would be of huge help to groups like @sndbox I think.