I have a lot of requests in mind but here are the essentials - (I'm not sure if these are available already but here it is)
1. Joining a league
a. Filter/Sorting - be able to filter leagues who have custom scoring, current status of season, current open slots, total teams and with some other sorting like fewest open slots, highest rated league, etc.

2. Player stats
a. Filter - more filters on player stats like stats for last 3 days, 7 days, 2 weeks, a month, etc


These are just the initial requests if possible, until then. thanks.