suggestion: force giveaway winners to give feedback of giveaway?

Good idea.

Errr no, this is a very bad idea.

You do realize many people access the site from tablets and mobile phones, right? This means they aren't always able to activate a game when they are on the site or when they first see the key. The one week rule allows for plenty of time (people have jobs, kids, other real life obligations) for people to activate a game key.

Some of us have more important things to do than rush to immediately activate a game key.

EDIT: Your giveaways only ended two hours ago and you're complaining that the winners haven't activated yet? Wow ...

Imagine winning Final Fantasy XIII, having to download 45G of data, that can take a while if the person have a bad internet, and I'm sure he wouldn't like to be restricted because of that.

Some people also just win game that will sit in their library because they entered the giveaway just to enter the giveaway, or because they want every game on Steam idk. and not because they want to actually play the game.

You already review your wins:
Recieved/Not received

What kind of review you had in mind?
"GA creator sent me key then removed from friendlist. 2/10, would not recommend!"

FAQ helps. Both side have 7 days and this is right.

oh god no.

okay, completely restricting the site is a no, but how about a limited number of access to the site per hour?

it's already in the rules, the winner has 7 days to mark it. even if they are online they are following the rules. :3

Just gotta be patient. Don't worry, after the first few giveaways, you start to earn more giveaway slots. At the moment you've hit the limit so it's understandable if you're eager to create more. Winners have 7 days, people don't spend every waking hour on SG and there's no way of knowing when you'll win.

As a tip, generally if you want faster response from winners, higher level giveaways will achieve that, if only because higher level users tend to be more active on the site.

I cannot activate won games from Monday to Friday. I can and do activate them only at weekends . So why would you want to get rid of people like me?

...

People have 7 days. Stop stalking them. There's a thing called real life you know? And just because someone is online in steam or whatever doesn't mean they have access to their own browser/cookies/logininfo etc. You're making assumptions about their behavior because you're impatient.
How would you like if people comment on your profile that you don't give the key as soon as the GA ends or something similar?

Too much. However, another idea would be that they can't get the key from key gas before they have marked it received.