Good point ptillisch! I think it's possible to miss that part if you don't read up on everything about v2.
But since version 2 has gone gold, and is looking pretty stable. I think chances are bigger than ever that we will have a portable mode available in the not so distant future. New commits are done at least 4 days every week so the IDE feels pretty active to me.
If I knew anything else than basic C# and newbie C++ it would be amazing to help out with this but for the moment I can just wait patiently 
. It's an amazing free platform so we shouldn't complain.