I guess these have been mentioned already. With these I would be relatively happy overall.
1, Fix the most glaring errors, like forum replies not being shown currently in the Account tab (it used to work, now it doesn't).
2. Add the ability to see (search) all messages written by a user, especially myself.
3. Optional (enabled by default) two-step authentication, if someone tries to change either your password or email address. On top of that, an optional notification to email if someone accesses your account from another country (or a new PC; but in my case this would be triggered all the time if it is based on cookies, as I always automatically clear the cookies between web browsing sessions).
Marioface5: Pretty much, yeah. If the discounts were consistently high enough, then I wouldn't have a problem with them.
I look less at the discount percentages, and more to what the game actually costs (compared to how much gaming value I expect the game to offer for that price, e.g. I'd be willing to pay much less for a short and amateurish indie walking simulator, than a discounted few years old high-profile game).
For instance in the current sales, I've happily bought many games with e.g. 50% discounts, I still felt they were worth the asking price. The other day I felt so odd you could buy games like The Witcher 1-2 for a few bucks each, it feels insanely cheap for such games. But I guess the expectation is the sales for them are now quite low already, competition is fierce.