I didn't find any suggestion forum, so I'll post a few annoyances i have found so far:
1. i like to have a focus on my companion at all times, so please make it so that using a mount does not break the focus. IMO the companion should still have focus when unmounting.
2. As a long time MMO player, i have always loved using the auction, and have used a lot of time in it to sell items i make. So to me the auction is a very important part of a MMO. That is however not the case in this game because of 2 things:
you HAVE to fill the required fields, something that stops you from searching for the item you want directly. That's just extremely annoying, and will limit my use of the auction severely.
i want to be able to quickly search for other postings of the item I'm going to sell, to know what to sell it for. Now i have to fill the required fields, then filter by name. E.X.T.R.E.M.E.L.Y annoying. Not user friendly at all. I want a search field available at once, with an option to for example shift click an item to auto-fill the name into the search box.
It almost seems like the developers don't want us using the auction, considering how little user friendly it is.