Wiki should be in the channel's documents folder in SharePoint
Currently, the wiki for a channel gets saved to some arbitrary place in SharePoint. It would make much more sense for it to get saved with other documents in the channel. A wiki folder could be added to each channel folder that can't be changed/moved, but the contents could be accessible from other contexts.
The channel wiki is an awesome feature for software teams, it just needs to be accessible without having to be on that team.