Are you being offensive now? :0 (errm, i can say this right, this was in reply to the post above mine -.-) I, myself, have though about one-way walls, but it can already be done, no need to add another 4 walls to slow TPT down just a little bit more. Powder Toy wouldn't be fun if you had an element/wall to do EVERYTHING that you can already do, it takes the work out of it, and the work put into it makes you look more skillful and have a better time creating it. (BTW TPT wouldn't be any faster if you just had an element or wall for every possible thing you can think of...)
PacBrad, people would begin to like you a bit more if you stopped posting silly element suggestions that already exist. It may stop people from being mean to you. Also, how was @OnTheToilet, and @mniip being mean to you? They were just suggesting solutions to do it. By your logic, @boxmein was also being mean to you.