I DID THAT!! I frikkin sat there trying to find out how to get my (upcoming) Sackbot to walljump! And right when the logic was perfect, they released the DC Pack! Ugh.. Well ok, it wasn't that hard work, and my walljump is better, but you get what i mean.
Lots of people had made walljumps. The first thing I ever made was a double jump, followed by a wall jump. then I got a broadband internet connection, and found that everything I had done was already done. But hey, we get the great feling of discovering it ourselves.
I think Darkstar was more referring to how it was possible, although not very easy. I mean the walljump sensor saves space and time… It also has the cool sliding!