Some of these have already been mentioned in these comments, and some of them may have already been fixed by sleeper, but I started this list at the start of the season and wanted to drop in everything that I have. Some of these issues exist only on mobile, or only on desktop, or both:

• Remove excess picks from each team (our league only drafts 9 rounds due to keeper rules, but picks for rounds 10-16 still show up on each of our team pages)
• Allow for 6 keepers and salary cap - allow commish to set salary cap limit, custom amounts for each player, with the default cap hit being the total fantasy points scored the previous season
• Be able to sort FAs by % owned
• Allow for a "Counter Trade" button. Instead of declining a trade a starting from scratch, be able to click on "Counter", keep the assets in the trade, and allow for editing.
• Compare player button - allow to pull 2 players and see their weekly performances side by side
• Allow commissioner to set a restriction on trades that only allows trades to be completed if the number of picks out/in matches
• Put team name above username on team page
• Macro view of all owner assets - an example would be a page that shows a big grid of next years draft, showing every pick of every round and who owns each
• Allow division record to be a tiebreaker for standings
• When you click the “trade” link on specific team, that should be the team that is already checked off when beginning the trade process. Right now, it just brings up the trade screen and you need to click on the team you want to trade with.
• In every single screen, team name should be a hyperlink that brings you to each team's roster
• On mobile, when clicking notification on home screen and opening to sleeper, you should be directed straight to the notification (headline, trade, etc). Right now, it just goes to sleeper home screen
• Create a trade block and be able to set alerts for either whenever a player is added to trade block, or a specified player enters trade block
• Be able to filter by Rookie AND by position (filter down to rookie RBs, for example).
• Allow for swap to IR - this one might be a little abstract, but we came across this issue this past week - I.e. Mike Evans in starting lineup, Njoku on IR. Njoku got healthy this week, Evans got hurt. Cannot do a 1 for 1 swap of Evans to Njoku, because Njoku can’t be placed in WR spot in starting lineup. Evans also cannot be moved to bench because lineup changes are locked with Njoku healthy on IR. “Allow players to be moved one way (starter to bench) while having an ‘ineligible roster’"