Improving steam options

Hello.

I'm an old player, and I've came back when the game was released on Steam, and I have some suggestions that I think would improve the game a lot, and arent hard to implement, they're all related to Steamworks, I think.

1. Invite steam friend to play: With this, you can invite your steam friends to play with you. When they accept, they connect to your server. The inviting message is like this:

2. Show when you connect to a server: I havent an image to this, but its like this:
>player1 is chatting with player2 on steamchat
>player1 connect to a random teeworlds server
>a message appears on the chat: "player1 is playing teeworlds, click here to join"
>if player2 clicks on the message, he connects to the server that player1 connected

Terraria and Killing floor have this feature. Probabily lots of others have too but I dont remember.

3. Screenshot feature: with this you press f12 and take an screenshot. Its saved on your steam and you can show it on your profile.

Probabily there are more things that would be good additions that I forgot to mention.
Sorry for the bad english, its not my native language.