It would really help if someone got on this, sooner rather than later.
Not having a proper fullscreen mode has gone beyond merely being annoying to being an actual interference. I should never be dumped to a window running in the background simply because I clicked on an item in the vendor UI (IE: selling trash, etc...), or have the game focus taken away because another program sent a notification to the system tray that would normally not interfere with anything in the game.
This may be your first MMO, but it's certainly not your first game, given the alleged number of industry veterans on staff. This is the sort of thing that should have been resolved in Beta, not left as an afterthought at release.
Resistance is not futile! Say no to the Greed Collective™. Boycott Crown Crates.