Two items on my wishlist:
1.) Overhauled search. The way Google is integrated as their search feature isn't right for Steemit and it looks out of place. An advanced search where you can search by keyword and tags would be really helpful.
2.) Switching the default view to 'hot' instead of trending. Trending is dominated by the same people day in and day out, which makes it harder for new people to find other authors.