1. Real Time sales stats + separate column for refunds. (Probably going to happen soon, the sooner the better).
2. Community picks are staying on the front for far too long. Doing more frequent picks helps others have the opportunity to get more exposure as well.
3. Polls are a bad thing. People can easily redirect a lot of other people to vote for their package. You can easily find out what packages the community has liked the most by simply looking at how much they have sold. Start doing community picks from the top of the “most sales” list and go down.
4. We need to know the client emails or at least a way to communicate with our clients. We need to send them emails about new packs, discounts, updates, fixes, tutorials, free content etc.
5. We need a way to verify our clients. Could be using the order ID.
6. We need to be able to update our own packages. (instead of sending the files to epic and waiting days or weeks for it to happen).
7. We need to be able to edit our package descriptions and images. (instead of asking epic to add this text or that image, which again takes days to weeks).
8. I know all the reasons why Epic pays sellers with a 45 days delay. But I also know other marketplaces pay their sellers much more frequently. Some markets even pay sellers weekly. Why not shake it a little and do it like others? 
9 I remember when someone mentioned why is that while Epic is taking 30% they have so little focus on improving the marketplace and implementing tools to make life easier for sellers. And Sweeney replied “Even with the 30% the marketplace is a break even”. I’d like to mention if it’s a break even situation it’s not because of anyone else other than Epic itself. There is a tremendous amount of manual work done by marketplace team that can be automated, some of which I already pointed above. The is probably at least 6 months old and literally the only improvement that has made life easier for us (at least me) is that we can mark our packages as 4.x.x compatible by ourselves instead of going through the emailing procedure.
I’d make another post if I remember something else later.
Thanks.