For point 1, is this way effective enough sir? I mean that you will be a bit busy to receive lots of PMs by implementing this step.
Theymos hinted that there haven't been lots of interests in such private giveaways, and possibly he/she is not expecting applications which will be more then he can handle. If it does become so, I'm guessing there would be a contingency plan to cover for it.
I'm not sure that anyone will ask to set up this sort of giveaway, but I wanted to mention the possibility. If more than a few people ask me to set these up, I'll probably make it so that anyone can set them up themselves.
This feature would surely improve privacy on the forum if it is utilized. I have once
mentally declined participation in a contest cause it could potentially compromise my identity and location on the forum.