[Suggestion] Let us manually add games to our wishlist IN SG

Today I noticed that there were games on SG which were not on my wishlist even though I am sure they would be if they were on steam. So I found out that in my region (Germany) there are some games (like Dead Space 2) that are not available for purchase, but if somebody gifts you the game u can actually play them.
For Example: I have F.E.A.R in my library, which is also not available in my region and I can play it and everything, I only can't access the shopsite.

So my point now is that I would like to have the ability to add games on my wishlist in SG, so that I can see those non available games in my wishlist filter, instead of going through all giveaways to see if there is one of those.

Edit: If you can't see the Shopsite, you also can't click that "Add to wishlist-button".