Make private Giveaways more easy to share

Hey,

at the moment its kinda odd to spread the Link for your private giveaway. I had a giveaway and the winner bought that game in the meantime so we worked out something else, but I still had this gift so I decided to do a private giveaway with all those nice people that entered the giveaway and left a comment as well (3 People to be exactly).
I added those 3 people on steam, one ignores me since, one didn't accept me yet and the last one won it simply because there was no competition.

To make this more easy I would suggest that if you create a private giveaway you can send Users an invite to this through a Member's list. They are sorted by alphabetical order and you can tick the Users you would like to get invited.

Those Users will receive the green box on the homepage saying "You are invited to a private Giveaway. Click here to get to the giveaway."

Maybe create a random, unique URL as well, so they cant spread out the link.
--> http://www.steamgifts.com/giveaway/<--Unique ID for a single use only, generates a new one if you refresh-->/magicka-nippon

Maybe even add new points:
[ ] Public
[ ] Private
[ ] Members with xy Comments
[ ] Submitters only