I know about the Help:Shared images page, but I personally think using images from other wikis should be just like using interwiki links, in a format such as [[file:wikia:c:wiki:File:Image.png]] or something. It would be way easier. Also, I've seen a lot of people saying comments take a lot of space in the Wiki Activity page, so I suggest that there should be a separate page for comments.
I also have some suggestions/requests for the mobile sites. First, I wish the Recent Activity page was brought back, but in the same page as the Wiki Activity page, same for history pages. I also wish that you can go back and forth on pages' history versions like in the full site, instead of having to go back to the Recent Activity page in order to see another version of the page. I also wish it's possible to post comments (it was already possible in the previous mobile site) and also edit them (which wasn't possible in the previous mobile site), and that Message Walls and Forum/Discussion pages are made compatible with the mobile site. Also, like how main pages for mobile sites can be made separately from main pages for full sites, I think the same should be possible for Infoboxes, so that wikis don't have to change their infoboxes to be compatible with the new mobile site.
Finally, I want it to be possible to highlight discussion posts like it's possible in the forum.